Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98097fa88add879…

MALICIOUS

PDF

90.1 KB Created: 2021-06-22 13:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c814d849f659efe66462f7461bbea893 SHA-1: 87ad2b0af3ab15e96e846d9f5306b1b98b2e95eb SHA-256: e98097fa88add879492d0ba13a2e26943a885112c53ef145dc7a3a5e600b036e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8017

Heuristics 5

  • 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
  • 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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/595b733ea090c3ac6672deff89c290fa/movudeximivekemobeto.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c9b0c45---fajawafavoranoxez.pdf
    • http://bjbtrh.com/files/pic/file/pizawig.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e7761c93---vuwuvurikeveveximop.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e5cja73jtsdocba3kb61es3ce7/58011018693.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b707093f---92490307289.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871307753e2---venaferelomodulodisewil.pdf
    • https://dm288.com/slicice/file/tisaminirevalanu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m5kal7c9bomloo961b8377rgeb/vibizunesofuberetetiriro.pdf
    • http://hungbuloon.com/media/ftp/file/buzupapibiju.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/748bb4c25bc71a3badea8d6ed51e7ee5/gukujifebozitubosolivuna.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609680a1cd431---juxogemonek.pdf
    • http://www.heksan.com.pl/file/8295556663.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a748ca87a97---92272948626.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b115952e458---13681088439.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a00259d035dbf0b63b5e406e1b371a1a/17636906354.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=miraculous+season+3+reflekdoll+full+episode
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011943.bin
30efb57886611b9db89c46693290973b8737e3a4e5868fe49c75223fa4c734c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 4480 bytes
font_01_sfnt_off000128e3.bin
5409cb120c361dc41e31afde3e1d1086e519d4c3169376a786dfc360f54ccedd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 5384 bytes
font_02_sfnt_off00013b41.bin
6650002404da0915077d5e911b3e7c3e3610073865db32557f95b59e93bab18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 6416 bytes

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