Malicious PDF — malware analysis report

Static analysis result for SHA-256 1676b1e8c4af7e3d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: abdb6d2e242ba6d5c96682a3edbdbfa5 SHA-1: 804e1750639122984faa8fa8c7e0384386f9e572 SHA-256: 1676b1e8c4af7e3d3ebdf0d7f5427e393b32a7d0dabb9964a21c01f6437e5e9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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.
  • 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://laarakkers.com/ckfinder/userfiles/files/36653881867.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/15263774476.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138dccd43838---lolemewabewovutakomemi.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/38319954544.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/38430828279.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/28062127275.pdfIn PDF document text
    • https://trexanh.net/upload/files/lidukuxamafedepuw.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/30444650273.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/223edf38eae0c2d69f8386b3cebc9899/nugagotevirunozute.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/44937314833.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/94820048857.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1dl5gpo6b3v9ess435tvtdsh7g/bolubobisusoluwusawet.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vozesoniramuxatok.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/33268199673.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383659e298c---bafepekagig.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57913449719.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/lojubusidozonujarido.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85876445117.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lepuwu.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35211654175.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/vezozigodizufilaweteruj.pdfIn PDF document text
    • http://trieuduong.com/images/Download/tunekitabiliwek.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210903232410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lord+of+the+rings+read+online+pdfPDF 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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 10732 bytes
SHA-256: 5f8d2b45ad34d642440b1245add41111e07cc53192f7ddbc986179e3730bc0d0
font_01_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16752 bytes
SHA-256: 6a7ddc0318897c95bfe9347864fcec5ec1ba29e458730b3c4e2d2ece3f12d9cf
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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