Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1014f8859dcf64a…

MALICIOUS

PDF

67.3 KB Created: 2021-09-29 07:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d7a60aa6ac9abf393fe31a7d3c3f0676 SHA-1: 7b6408b3bc4b59b91ae27808a5a98c62ff74f2ad SHA-256: f1014f8859dcf64a778d43020686005665dd5872f45121edea629c79360d434c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing attack that leverages external links to deliver further malicious content or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=watch+free+vijay+tv+online PDF link annotation
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304838605301.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/texofuweniwil.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/kofelujitosuwowep.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/dejeradak.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6e1d6ed3e14f04bcd5507e49e11c216b/25710402064.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/31284591598.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lumesesisapawurirona.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6a0104f3---28727354556.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/93122928175.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/31999472451.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/jofonufuvanurasasuzigap.pdfIn PDF document text
    • http://soles2walk.com/data/file/16456366499.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o7nn0vrun1a9je2on5vg4aqi7r/zujuzikozubovete.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nixifixixiwadilulowewixe.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/nofemufixu.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/finopeletuvupejefifomik.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/tibipekog.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_off0000ab64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB64 10568 bytes
SHA-256: cdf77905fdd43abf557f79d17198bcb5f79e285e8fc024191cedf0284436c413
font_01_sfnt_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 14608 bytes
SHA-256: ee7d347a6d8861f6dbb1ab4d769fd8460a99065fad7042c381e57a29ddda70a3
font_02_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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