Malicious PDF — malware analysis report

Static analysis result for SHA-256 3681ac4cc2a8b7b0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 21:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59fbc3bd1bf2ae837dfd4d736b4ad346 SHA-1: 43bd4a51a02b565c7398a21b1796620a0fa9fead SHA-256: 3681ac4cc2a8b7b0dfcfcbbc446413d0214c7c753e342c042009373f91318704
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple links to external sites, some of which point to compromised WordPress uploads or use IP address literals. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and linked URLs suggest a credential phishing attempt, specifically impersonating Facebook to lure users into clicking a malicious link disguised as a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 11

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+remote+frp+apk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://emilygrilltogo.com/uploads/files/wakodeweje.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zopukujirulawiporokuwevod.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/topazevegazofobutubuli.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/werajomibumoden.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lobuwututis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d1b9888a---14258077028.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/43988016876.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210913075238.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613de90e3c638---52522634001.pdfIn PDF document text
    • http://maulich.vn/attachment/files/fogiletasedanudilazo.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jafumodunatafu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/daxajibawupebo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01a279e80---vazifefaxutomajut.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rozexijewoboset.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613d175e3fa1e---wedogaboginulaw.pdfIn PDF document text
    • https://onlinendttraining.com/files/mamezemavu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/rajibukewapezopinezoxe.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/genezojijonofamidetulazu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef58d3960b---31837572335.pdfPDF link annotation
    • https://hygradeinsulators.com/images/uploads/file/82283430548.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/49756765323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+remote+frp+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 10580 bytes
SHA-256: f7ac5fb9a6932b4904ae42e160a88bce928295e4ad59b9a4cac76efd8e682f0d
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 21072 bytes
SHA-256: e9848a6ce5d8cf9bcc4cf24c96aec85afe9566d0064d736b3f5aebd895aea809

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