Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fea688e7dbce034…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 16:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcf8fb66bb351dab674330b67cd4f192 SHA-1: 0ef82be9c705c50a44665cbf3099f243c07fe2bb SHA-256: 0fea688e7dbce0346c67f67e33fe505b6cbdb064747e393a864a4376b115a132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mistral-paints.cz/userfiles/files/23151316664.pdf In PDF document text
    • https://ka-base.no/images_students/files/bozovakolenonajetolowopaf.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911100425338019.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/97414189202.pdfIn PDF document text
    • http://nktrading.qa/file/files/vuzetakebaredapoxutajovu.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/rixituketelew.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bea0542dccf48314a31bf1621d958a59/8263821086.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/19e4627cf599740dc3db553366f7abd8/jegutevidomivu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/vusuxakevovunon.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/19587392768.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939145feb4---93201061475.pdfIn PDF document text
    • http://dhf-china.com/d/files/62029162782.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/kirujonopevutazuzesopevab.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/23502398682.pdfIn PDF document text
    • http://potya.com/lifibudineramo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9e492e4a9d116313aa5c384012229d14/nadipiworawikufa.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/rasuvobejijurodeg.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/dezovekejejaledipuvife.pdfIn PDF document text
    • https://superchills.com/userfiles/file/tujodod.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f0b448452b2f2dde2be2df7751db6666/48595809944.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161456f00b5321---9864223964.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/jisuzuzizimilubojel.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/tulidumexerufa.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/95675399580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+mobile+lite+no+recoil+hackPDF 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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 10844 bytes
SHA-256: 5dcbbb16f10206d368e01be9b1069873206790e6e8d28e91c880f3a92a69c11a
font_02_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 17800 bytes
SHA-256: e062a5d6b9b6e8429198b2d5ed5ed54eb694ea73cf4606da1809d8bd18b8b9c6

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