Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe05a9871cffe359…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 04:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b53a28552cbb7cb73169afb5c0d371cb SHA-1: 8ac611ecf13851666e22e093fccf1b5df7c05f18 SHA-256: fe05a9871cffe3593bb84bfa52dc7dcc776d879c9dd2de40d3c6042ceeda6a82
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The presence of a 'callback phishing phone lure' heuristic suggests the document is intended to trick users into calling a number, likely for a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=pixel+3a+xl+custom+rom PDF link annotation
    • http://artdental.hu/editor_up/fimeka.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/19105029326.pdfIn PDF document text
    • https://bachson.net/upload/file/jirobigebesok.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/22309021639.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/68982935467.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/99873561496.pdfIn PDF document text
    • https://latework.cz/soubory/1294375428.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vowubodesalewipite.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87956019839.pdfIn PDF document text
    • https://naves.cz/res/file/22701823458.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/24324421439.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161311e53b67b7---18820545402.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zawokaladusomunojon.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/kewokikopuku.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/58030166736.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/79048605812.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecb0e3aff---33961769427.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d00f47aece2b29268c767988aa380a75/78195895991.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/88761562062.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/mutiputederonaze.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/gagorubizozojesif.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mujorerevufalulemawoji.pdfIn PDF document text
    • 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10664 bytes
SHA-256: 028fc2df01e380519155e5323be3f6137221b2323ac5258782fc3fc71cd4da7b
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 18420 bytes
SHA-256: 052d752d87da4fa4fdb26b7b0c970d94b5a5d43d59dd70e1f6eec27de164da1c
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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