Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0232f6117506cc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 19:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2352a5759fa9b51003d9727ba35a656a SHA-1: 1668e240fd6b7d3cc1dcbdb281b71b82537fda1e SHA-256: 9c0232f6117506cc40eea3a300cc9c4202736d6105dd6199a8c137f4f0cfd4f6
176 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85055298985.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/83820790229.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/10222223889.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fbea95940eddd55da9dadec5930e41e3/87519019065.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/18149530303.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160714e50cd05c---foxexufusigubesemu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/vikupit.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2c22c6c9---45541586997.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/70623102996.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/rimalopidanitesajamakef.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/jesafumulokabagizoxelaguv.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021080408560536.pdfIn PDF document text
    • https://defi128.com/userfiles/files/72909526296.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e17da25d721df94a43f6bca0e27b1198/97724666107.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/93709998493.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/57441780211.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073f740dedbc---90163659228.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a79d62786---dagenuxigatisow.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/47512938486.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/dosipavomijovuxazikiko.pdfIn PDF document text
    • http://sooclose.eu/upload/File/66938790651.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwogesolufiw.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bojapoxuzawikimefom.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608719137f298---vakefisum.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/15284407659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rob+lowe+and+familyPDF link annotation
    • 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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16376 bytes
SHA-256: 58557ec8ad40f679cb7087467dd4ef7b71b45a8faed33a44f270427250699777
font_01_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 10532 bytes
SHA-256: 41cb89a6a4db2cc08c4ea9d9d51eedf7ac50c40576510e9d3b8bb5c15e0dfe7d