Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde9dce96a81e54b…

MALICIOUS

PDF

71.8 KB Created: 2021-06-14 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d8f3914df289d9e6e1b1650393c8c41 SHA-1: fd46375224604b9cd26849f1b69f80580215a386 SHA-256: dde9dce96a81e54b45d30fb4ee3e690ec691a52acb27bf2f51dcacd96a5d70e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=7+hermetic+principles', are likely used to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=7+hermetic+principles
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6fe25a31a1b0f7d682975309025f2ca8/37881142942.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0cb3dca8fe077d5eea25c133ce0c097c/75751059546.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f70df019a0b6c6622532362efce9bb80/85260427534.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/dusudilunamiri.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b826655489---vudefaxefidetuxopu.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608356d88f0e8---49065491338.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/90951a3bc4ad7dee09f5336af22ec2f8/89934098196.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a6dbvn915d9d5bjnfkmpp3197g/42860936103.pdf
    • http://highendschmiede.de/highendfiles/file/zebigibinokilexibufuzu.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbc25dd34886a7a16e8e9dd10ccbe8b2/36271661139.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/99402284348.pdf
    • http://sns.hu/_user/file/pimat.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f702re6s3aq1j3mnskg3mtsqe0/68082431350.pdf
    • http://szao-spb.ru/images/news/file/62123157915.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/pilegulob.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/abc6f4b3364bbfbcda17801482555d4f/mofuzagule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin
e1f0e9ed22ded2669f78ee2cda871ffd14c1477caface81f96622056cf04a5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 4948 bytes
font_01_sfnt_off0000f83c.bin
d919f5759ea456eae9c59707455d839efd35de26dd493c05427bdceeb7480092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 10528 bytes

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