Malicious PDF — malware analysis report

Static analysis result for SHA-256 601b168d1314207f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-04 16:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c35ec78d365a02d9c2f60dee78fde58e SHA-1: f0baeac938fb39538e4f498afdb9f50619b61d5f SHA-256: 601b168d1314207f5889355945a7ffa6e845a38b45590b9916f00b4ae5b47399
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links suggests an attempt to lead the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://monkey-do.net/userfiles/file/11045445661.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/pomuwilinufegebo.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jqrrbg1rk04or5uhof3dv3b286/rikipim.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/81259586380.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/fasubaruwuxesolabufomu.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/zinanutusebonujojeza.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/94947123072.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/50041861513.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae22b63beb---wujadimigafubiriv.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/fijokokazedanajefuv.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/nebitav.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/mifomeborobojo.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/somoj.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ff86754ad78cdc96de1fb8202aac9ac0/13023524779.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/wibivanuw.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/fedexudarenobul.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/39884845327.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fa2461d543a2ff90c1f12d641d5755b0/54717948396.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dazesivu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607689f05e130---33485817175.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160900861ae850---96902724922.pdfIn PDF document text
    • http://kleiberit.ru/files/file/lesetibetifarozubuxoxola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=yoruba+praise+and+worship+songs+lyrics+pdfPDF 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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 15900 bytes
SHA-256: 3a936f069c58db5ba25ab8c6f944b8e9e98f986c86c3650d0c641e9dfb530038
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 11224 bytes
SHA-256: 30f2e789361fc76be8bb0acbda007ee960fec06e2316ddc9af9f26420ba433b6

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