Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd53f9ed85958f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-07 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 774277ab37601f985578ce33fb152768 SHA-1: 8604193ac7596018aeb3fba7cbaf3236529f982a SHA-256: abcd53f9ed85958fdc82cab6f8feb5882a59175fb72152e48123ca5c1be4b1a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kripasec.com/userfiles/file/wetojikixatup.pdf In PDF document text
    • http://grimastone.ru/files/xuref.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/77103561300.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/75252455110.pdfIn PDF document text
    • http://adveotec.com/img/file/nenobawawom.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/sugarasoxupaw.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a5b87cf5eb231ee630cbdddf34270a71/95964206707.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/70254775740.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf292cd6a9c---rivajazotuw.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/rixefulelidoje.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/71382611512.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56dc60df872c95056eca90a6f124f3a5/limitol.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jabijopifatigufabo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7be0ccb3---632398124.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16259147955331.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210730071417.pdfIn PDF document text
    • http://cga82.com/admin/File/povokemuvijuxuladubulapo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lifix.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f6592622---bopalivemobuzasevigugo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03629cffa3fe7c4bf18c0d98f86b7b5/77038173093.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098889a34a5c---mavil.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/diwiwevowalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=3rd+angle+and+first+angle+projectionPDF link annotation
    • 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 11000 bytes
SHA-256: aa498295b535ad9a42f452a010dae2a0bd5c1bca02fea3b194292d811a07b602
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16684 bytes
SHA-256: 2eb02ce35bf8554493625a71638b11fe53c19c91f789452be37906e8c5279562
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1