Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b08f6e156863ed…

MALICIOUS

PDF

99.8 KB Created: 2021-07-31 13:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4ac22621fa7eacfbf7136d8fba188308 SHA-1: 058b5b547b49f51b5b0714c2437aa62c3d7035ce SHA-256: 03b08f6e156863eda5b20fdb144e45145c61a18803b205fb6ccc315e7c2e9309
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and callback phishing pretext further supports the conclusion that this document is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=descargar+hcu+client+crack+2019 PDF link annotation
    • https://civilkontroll.hu/uploads/file/32186844472.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b872c8f3c---42723014938.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9cjmrvi46ft06ik0q9j8o26554/fobigazidinomipe.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c857329e63---74177486241.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccab3a48f---46282660647.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/wokajojivegepixegu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3bc3066---40015684586.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071009515380554.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd2fa5d1c---94295079892.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125d2124e3---89282529524.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2bbcaf9fdf2cfcabf7b04b9832fd3ebd/vivilekaniwufapifesumekar.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983766b765e---47112571503.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/25d7169c971b78294f553f10d5d05ba6/26936324816.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b137b4c70b6---rolukevivexozuwug.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48591bd11---tewuvosudutopixejajobi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lolizelelibavutulerigitu.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/22218103361.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/634f472fd28a14df853712d4ae37ab8e/56951719240.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/16540610297.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/41672705031.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bar5msi3boisj4j4ae8fvkm777/93254053598.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/wobedavibidaratitiven.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16728 bytes
SHA-256: 7b20430ef9838ead9917b8dc1612bc136ee880c2b49f765d0286c21d9a0f8335
font_01_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 17124 bytes
SHA-256: b0497e4416ec216269a9ea5e180db40bfc7a801c95aaea8478b360b3b9448010
font_03_sfnt_off000164bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164BF 11044 bytes
SHA-256: 0eb55c1a191d7f4988617d7db2bd1032a4d527e354425afddc9c8fb45767895f

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