Malicious PDF — malware analysis report

Static analysis result for SHA-256 13261b40cbaeb9d2…

MALICIOUS

PDF

79.1 KB Created: 2021-05-21 05:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bfcd08eef4c73b8c0668eb4e74d9bac SHA-1: 44cc191e1fbbf0b504f0a819b49dd759e2854ade SHA-256: 13261b40cbaeb9d26606b9e8713324917ab25777e74688f903cc2ce59eaf7fd7
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080a65d12a6a---32766992792.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49dbbb73---xaxixofafawevenex.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/268eeaa15e35c1139cf616c152139867/gowanipi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2d9329c1c41e0dd415007f019a173983/15661445219.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bc227bf0---vevovodevera.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/15f45008bb449cf1be98d9beb827e03f/xazevinokasi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1f5e5fb6---gotifuloxilagiweroxe.pdf
    • http://atthaya.com/file_media/file_image/file/lowewukefomuzisoxinezuwa.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7e5679483809094acc5b599283c147e3/82101836417.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc25314dd0---dezasi.pdf
    • https://abofahed.com/userfiles/file/kolitugedaze.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/10420149ba1591ef6ab7ce0556c16fe7/20762719469.pdf
    • https://mfdesign.hu/files/file/99921980998.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8902c023a6e0f57399730045851ea36a/74814971511.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d20a627a5720f5a0656f66f17d2c741/57035917370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vics+modern+warfare+mod+crafting+recipes
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c91.bin
18718353acc5535294510990de7bb1ecc0081b51a786f9aa89510d2c80d9f93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 5500 bytes

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