Malicious PDF — malware analysis report

Static analysis result for SHA-256 098cc86f8be83f10…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 23:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e951d3ab2ba96366c48564dc1aea9b54 SHA-1: 9581cb1318e9dae75aad1854c17ca5d14f7ff6d6 SHA-256: 098cc86f8be83f10494409e7bcfd2a83a7af6fee7dd09b024ee43c28ce32fedd
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7452

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115abbb31841---mogarexutofonuwodipi.pdf In PDF document text
    • http://psychologadamczak.pl/userfiles/file/9162359237.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusabamoranoloregudar.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/92601160832.pdfIn PDF document text
    • http://telecycling.org/files/file/xovesekunimig.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/snba3lc1i4g5khn72is3t79p85/fijironikutalekorezovul.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/99576209342.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/16976107378.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a1e74afba64b7e2890e3ec9e277c4fc9/dexulufokapulajimeda.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27068588091.pdfIn PDF document text
    • https://abeess.com/userfiles/file/nevaroserawitivobibokavo.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210718022818422501zma4ljs0nhg5.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/jazujivajifozoxatafomojuw.pdfIn PDF document text
    • https://marigabung.com/contents/files/17076833536.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/biletadalulas.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a587a0dc4---21131948013.pdfIn PDF document text
    • https://reniuved.it/file/54835928925.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/31571210511.pdfIn PDF document text
    • http://rld-carbon.ru/file/gapodipivamelorozujawo.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10353367970.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/80505259430.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/71527098679.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/gituma.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/49005765563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=math+worksheet+2+digit+subtraction+with+regroupingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 11276 bytes
SHA-256: b691b061db15eecd53d78b80d6edfa0e29fcc5b12ad00bf13211eb7d38af4f5b

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