Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21c9540321d0a5f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 12:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99f61a08afdbbf64805d37836c34442f SHA-1: 8d9f38554808968429fea8d98d2c7224d65b17e8 SHA-256: a21c9540321d0a5fa77d4346dc1f516a44ed555a4f748f9a456586239a350b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://vilocom.net/webroot/img/files/gobuvagokede.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a793e42d---83986433969.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/64837239644.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/21438634058.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/kinemuroxevovuwoxumozutaf.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/jujewigenufun.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/morikek.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ba0083a92a5efd3e216b796e2b537ce5/89390613496.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/surijopimagakulosogab.pdfIn PDF document text
    • http://etre-belle.su/images/file/1316537972.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tebesepojuwot.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d03cacb46ca2dae4f3fa89206cb3d627/vuluwijarofuwo.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/29825691827.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210627_099599F7DEB6F2DB.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/30781178028.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/30325183879.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210714163058.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c8e4a82d---vutazizu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kabozamiw.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/nagapugab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef323151dc---23720790478.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/rupomi.pdfIn PDF document text
    • http://usmleworkout.com/files/file/9156618853.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5gj3d7n3t8u4ajj2qre2egl4q2/68714284519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=make+pdf+file+smaller+macPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 10544 bytes
SHA-256: b98c6b5d6b4ef20414b1ffdc5061db8ca0fd8fe3f4aae927a491880716e5698b
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 17328 bytes
SHA-256: da825d2ceec8f5b169a3c273339457da4d26aaac490bf1f19cedc9960ab2005d

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