Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4a3c5fb4855699…

MALICIOUS

PDF

89.5 KB Created: 2021-08-01 23:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b748c54418faff8190193e51efe33c9 SHA-1: 8d5e242ac4374e280ec6cbaf9d544de5cc86136d SHA-256: 9f4a3c5fb4855699eea1eac6b3ae19c808f001f81c88a59457b10eddabed5e70
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9a751989---dogujevozulufelakejezafal.pdf In PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/weruporodejakopakatuj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b35cbc86b---77929305662.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/add26fd16e1a08f1e7155915f6de5094/goxulatadinetajamux.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/fomalumivuzimatenudibo.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/gazefoviruxe.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/ruvadogajijijuv.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1ikmh7f59u92jathgdpt3hcogg/60234998349.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3de3f645d729e8b6dfb6d078aa5348bb/71625092825.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/19343554820.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/35321438447.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b186f402---44527507975.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/079i5v91u9ev97s1j3q5de2dq4/nijovosuresidom.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/68686534295.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a7de4a40---61821177231.pdfIn PDF document text
    • https://kede.org/userfiles/file/xujifutupuwuterebefuzur.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4dc72421---23996408094.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/022032900c9ffb3eab86095c3207072c/62348495836.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/jaxob.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/nunedifanatotojaranowanur.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/5580102192.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b048cd8181f---jipubotunotopefofefedebap.pdfIn PDF document text
    • http://expresskaliski.info/file/vomulexutomewadadavevilif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dieta+de+una+semana+para+bajar+la+panzaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 18188 bytes
SHA-256: 981757eaf77154866bbb2fc39f6037bf80673c19e00e3ab1318887f7abac7053
font_01_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 10864 bytes
SHA-256: 075900dc501faaef2778f625632fa39654cc24b8aefa3db86137381141626b19
font_02_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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