Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8db44a44f6fe13…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 12:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bd65572333882ce0555a967e23b2af0 SHA-1: 7c5bac0fe8aad59da463d48c816650d6efcc4ead SHA-256: 3f8db44a44f6fe139ece626ffa8cc1dd16ab640bde90badd0be644f646668824
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bixenony.com/userfiles/files/49649766328.pdf In PDF document text
    • http://maroba-zirndorf.de/file/63092754983.pdfIn PDF document text
    • https://cargotavio.ru/files/file/78149226532.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e7af38e4---revefuvepaxijilawug.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/22129443500.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/brs5m9ad848iqvq9kk9phfn7mu/24997929111.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/5843624284.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612966e344352---66450013017.pdfIn PDF document text
    • http://labonscafe.com/userfiles/35423703917.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/pibugikepuwukekuzem.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a57988a7bb65b9ef600211a40c373127/taxuxiwozigawotaka.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984818677c2---fuverubovejesujo.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/76317792811.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/wizixesumabixowili.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/geripivukajumejapanup.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1a98f428---zadukadaguvudunisowib.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/19d48b41f3a4e11b501afd610899b41e/busajeseditalu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a8b09723---mofuva.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/39613960110.pdfIn PDF document text
    • https://strechybenesov.cz/content/naxarewaxuxoxed.pdfIn PDF document text
    • http://cochu.net/resimler/files/35467832116.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/padesasodinizipezuvubopiw.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/puwerupikenogoxopinuronid.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/lomalifi.pdfIn PDF document text
    • https://bliznacite.com/files/mubewegudeguzigexunakunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ministry+of+labour+numberPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10720 bytes
SHA-256: 5adf35c5f6e6fbfa010d775836e98a5fdf47298f7377b01507d0ca7092f3b2db
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 18276 bytes
SHA-256: fa8510d7c0af564d77660e2e6f792c5bd2353c78b56a9a3598dadd1ab33d0ada
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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