Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f04275903bc45af…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 21:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: faa8db3c7d8dd9335e49a7694b79cb25 SHA-1: 8ac15aacfccd4ba66081c12bc97900088adb6a2a SHA-256: 8f04275903bc45afa71393759cabf238ff5a4cb4386cd68e36bd856b6e536153
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing lures.

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 https://philabc.ru/uplcv?utm_term=redmi+android+phone+price+in+bangladesh PDF link annotation
    • http://liburnia.pl/userfiles/file/40841715152.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/43723535048.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/85571812972.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/95026323977.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///51283378602.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/giwumize.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/faloniwetesa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a62b94ebf---dodukisevajewemaw.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/ledazidegu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1978106919.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/munoboni.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b6f5839eb86e537308a751e958dc6a86/pizizenuf.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bejuzibivodizinuwajepoza.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/nekinoga.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bidelunopudowo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/itaroxorupepadaja.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210904132134.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131630a8ce09---deravofiwanokusidowanu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4695b4e6---vivapirusopixi.pdfIn PDF document text
    • http://guowangcable.com/d/files/vuvatebewozirizosaz.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/65846722210.pdfIn PDF document text
    • http://xhzhengli.com/upload/54092295311.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d866982f4c---74941714970.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210926_31AA225E11EB24DE.pdfIn PDF document text
    • 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 11048 bytes
SHA-256: bef7e60d60689b2bd6469014eea0d8106513d332dd8690b340e1bdf52d91f6fd
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 14716 bytes
SHA-256: 00350e0160ba0343204e68de5e68fcf8399718e0eddd720d181312d3b3874518
font_02_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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