Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40cf14e9509dad…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1d7b12e830c151207830095e9662cda SHA-1: b9645387c701e53330439d9f2e0eda6a2e04f60c SHA-256: fb40cf14e9509dad1b2062302e00763cc1a4027f95b79ab4770d3219fa1b291c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=probabilidad+y+estadistica+pdf+libro PDF link annotation
    • https://binhvi.com/upload/files/pugetinukisepuzabagowo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/66606312829.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/guguvaz.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/33011319651.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/30202949280.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/vajisinisumejuvekodena.pdfIn PDF document text
    • https://davnosti.ru/upload/87750012797.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tuzivo.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/90996282153.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/sopijusede.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae08c57a9---tupetalimurekutenorum.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613021da9b7af---70556382088.pdfIn PDF document text
    • http://falconltd.pl/cache/file/saselodiraki.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/53e52e1260ec923423418f1cf2627260/74835980641.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/zujivazot.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95183587135.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jisiw.pdfIn PDF document text
    • http://imoroz.by/upload/file/27015555584.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/dogigabamugapojusat.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30523839014.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/fekivanixafozevodela.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/kekogukexojopadaso.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/pefefujirefu.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/winanipaxerifa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 10764 bytes
SHA-256: 84689b3b5b0c8b4732eb4b1976e2642a42977665e693fd7c98eae906e2393924
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 17292 bytes
SHA-256: b17dcaa25ef1c47780bb1a997fb64bcc0227c3e0140a2c9661d62ef1693ff0dd

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