Malicious PDF — malware analysis report

Static analysis result for SHA-256 636302925a888d8e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 17:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fec3d48cd087886bc09eb33783bef893 SHA-1: 211df8e58f2d17c7b529fdd119d7ac346cc5721f SHA-256: 636302925a888d8e149c6508c07cb5da63a40b2177973213f74fd682898d6b95
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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://drafthe.ru/uplcv?utm_term=supernatural+s6+e2 PDF link annotation
    • https://stalbeckers.nl/userfiles/image/file/posezulifevodokimozeteg.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/vorimugolo.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/37964268688.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/povanedutonanopoxolino.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6135f439bb9a4.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2830f21d76ebc9789c6aa219ceb3d71/77918036847.pdfIn PDF document text
    • http://immopolignano.lu/images/80469955721.pdfIn PDF document text
    • http://hydratrend.com/application/third_party/ckfinder/userfiles/files/78930548012.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xubekonose.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/tawuvifo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bud8q3j973c7jvlb9foirlp9tt/3017801789.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/xitawutivemafonu.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/foxufoboxijav.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/70369830489.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/47794726459.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/78238824351.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/53906123815.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/daminogurazufuxizo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/662250c3671a2355204799dd0eec8f29/36661070477.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d86474a2c---70058033269.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/83638825942.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/49883968047.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 17024 bytes
SHA-256: c79f554b1d066157da60148bb5709bb141c898e0f9e35ea313cb343eddf76b76
font_01_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 10496 bytes
SHA-256: 491edacbf61c780a9f091d7a3f7c53dc75afe1d298758c3972a4005b3fab4554
font_02_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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