Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae98804bd9a054…

MALICIOUS

PDF

78.0 KB Created: 2021-07-13 21:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ad24c7e5182558c1046bed9aa8d138 SHA-1: e3f713111a21512d4e57a0fa87a68b67833f28e7 SHA-256: b4ae98804bd9a054ae12d00eb5ebe11038679d1f7e9346beca02a7a41cc46957
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8034

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=jack+highland+terrier+puppies+for+sale
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077781b411f2---32542031649.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d366732f514f3b3fd4039d1abed257b5/zesafavawawar.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/15194053372.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/lanasukulejokivak.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sa9env81fk2ia50nm490m6fgst/84560309794.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/90on2q1f20pq2bk61gam45h0rb/fepaguboragemi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609511a653ac6---54606934954.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9c8899a1---65385371342.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26f47b5679---kafotowizu.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d364d4b94df---fagiwojem.pdf
    • https://bursakaynak.com/userfiles/file/49674911489.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050307b005---76231867136.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ad4207f0---waganu.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eimr6t0o1o2prk2pk63p8uhp1a/xawiradifudavidafag.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/70f5f503a779a65fb84f14591b974794/zozifomutuzibebavolikep.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/51febc88f152612755a57eeaec3d54bb/mametad.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5f5d182be54e73ec30272afe69db2e6e/melisurakajak.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a858247ff8---40093856333.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97bcb73ed---jibugixodi.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9a1f1871---71697312236.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c16c4096---94828941407.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979e366e92b---39637350340.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca0.bin
791a0969738c69fc7d6fce620212574e8560831fcab256c5e2c8b014e36f7fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 20012 bytes

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