Malicious PDF — malware analysis report

Static analysis result for SHA-256 741e79f7d1218ba4…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 22:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90b186fb87ed3f897130e10d40c1349b SHA-1: 79f777a91bd26d606e3338d028f6857bb8c07ca9 SHA-256: 741e79f7d1218ba46773db387b9edb7bf4c81a1876b7b6263012f1869f0c29f9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly indicates an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://balone.net/_upload/file///jotesakewozebolew.pdf
    • http://usmleworkout.com/files/file/wikapizopajasexadege.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e39140370e17998533d6231103ed90ef/46302169112.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07bbee5d6---73324557783.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0a062095---rewikabedigupamonepivonol.pdf
    • https://cape-electronics.com/media/file/72114180915.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44j8j7rb6812h4gubqn87cubo6/73183824090.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9da2c00c---fofagukejutamigogesara.pdf
    • http://jarosi.hu/files/file/61493272397.pdf
    • https://tonwen.org/userfiles/file/jifujolesagixig.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gsgbhb5f5jfrrq76okavdg0asi/8235728076.pdf
    • http://divorce-difficile.fr/userfiles/file/xatolupajesugiforig.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d0a0747188726ddd708f8eea3366b9a2/58345031202.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c743ddfba51d9bad2567a2656466f5e4/76281493882.pdf
    • http://musiclivemarsala.com/userfiles/files/jipemegawepo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2cc4ab13---laxezebubiwiboxazibog.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae30b7d6e4---84129193611.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pig4vqj2jd7crt3s2o9nf0a5b0/geriletuwop.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c64ed4e51---sivagigerag.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a200723029dbf0bc9c6149a8112772e0/67397999883.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/809a1d6409c1d40428dfc4282834524e/91705772365.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/luie0elqi5sitj763q53b5qqil/22891716405.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085838321487---98329048141.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cs+go+apk+for+android
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/00c8438c0bc090ad5819ea3fb10afa4e/degiliratimogese.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe6.bin
b4ad63b2fac98cb430995e58c8057b88c21f2e0acd1796c383bd752e9130e79c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 17416 bytes
font_01_sfnt_off00011d86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 16792 bytes
font_02_sfnt_off0001359d.bin
cb9edf840714798957d105bb445783a9365ed468f84d4886273ce21c2aa69471
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 10520 bytes