Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca202b4fa37c85db…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 12:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 669aaa3a329b4d1729de37dd30aec53a SHA-1: abf2a6dd80f5e0b8fe790383693d4da36645e2dd SHA-256: ca202b4fa37c85dbb706b90f5616058843d39d731d44681ad1af7797990e82bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stephankeppel.com/userfiles/file/80727404354.pdf In PDF document text
    • https://fsreloading.com/userfiles/files/93272823076.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/lokuzilaronodujebed.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jewim.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe6bcc985---71285402566.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2esgh2s4sjr9rkhcvkr1uoi10c/nuzupob.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01e99ab53ca592c47dea745be9ed5e4/83883267427.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/89saeogkf4ei517iriaf9f73f4/75502425564.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/99568748558.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c578e1ef6---61417344885.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rezojawesez.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/jezudesakazefitarolenu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nirusotila.pdfIn PDF document text
    • http://skncn.com/u/files/92059839437.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489eb0054a2---puwejufapem.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6ad170f6f92e74540dad6d985a5514dc/43227794222.pdfIn PDF document text
    • http://kelvista.lt/images/files/jowufedojojubudavunezomik.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/86364033678.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5c0292af24e0886e5e636d51b9fa7e55/55405288993.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bijefonusol.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/23158195660.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/93142208199.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/76429755274.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387885e3cf6---pojop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bloquear+publicidad+android+chromePDF 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_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 10952 bytes
SHA-256: eb37c725e066001004fc554985bdb90876d7ba38bf2f53cae5f8c78d100eae42
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 17984 bytes
SHA-256: 1b147abf2c277cf323871f3c27451d45d9af746359e8500b76abd6d363f3290e
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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