Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9bc98f94a12659…

MALICIOUS

PDF

89.5 KB Created: 2021-08-07 23:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 734c1042a2b1e6903bd3331e46a14b54 SHA-1: 6370971eb3757a82a98be46d16836c62a6595b94 SHA-256: 2b9bc98f94a1265970ea5b78db29e723daba09abf103895ed2f83030bb8d0157
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or redirection scheme. The presence of these links indicates an attempt to lure users to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://baxsporthorses.nl/userfiles/file/duwutiginujorakiwumemat.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e1abdnji6movnt3479f2fg5t53/pebotuwovifono.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52avrj11cscg8mbukbmnfdrqa4/modipufazuta.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sonevafoliwawariw.pdfIn PDF document text
    • http://melabo.com/upload/files/xubolomase.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/divejumedum.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/kokimuwemupe.pdfIn PDF document text
    • https://ags-car.com/upload/files/9109446737.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/83854958655.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/gewosesoledorotoledu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/fepomefuzufisunidojatabu.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/20700310775.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jikumoromob.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/76819afa7c627c93e05d15a41d322ef6/54961069291.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a78fd3649667e21183b94d7668d605c/24116768549.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/40288423484.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60c5b1f19---kutopoxilagugefumamazanos.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b6003f7304277ab528f258a6dbc654c2/40981312721.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ab099044b---vamiguvebiponujibu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/8071172908.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3ed30b696a3a93b8effcd93bcd90591/46444140377.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rufilojegewanibesekako.pdfIn PDF document text
    • http://mcutech.net/files/xizufuguvezuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=google+translate+%D1%80%D0%B0%D1%81%D1%88%D0%B8%D1%80%D0%B5%D0%BD%D0%B8%D0%B5+safariPDF 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_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 11252 bytes
SHA-256: 0dac8ebcfbe589638bf5ec30a0a33fb2796bc914953841d2c74c813c2fcba514
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 23444 bytes
SHA-256: 48327bac01bd70392c904fa629cf3dd767b35e981ecd158456906f37b936ccda
font_02_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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