Malicious PDF — malware analysis report

Static analysis result for SHA-256 667da5fa078fa6b8…

MALICIOUS

PDF

82.9 KB Created: 2021-10-09 01:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 050bfdf490c9039d09e9046779d27b8e SHA-1: 6dddb6fac2e8550970d1bfd6a313708810d3fec6 SHA-256: 667da5fa078fa6b819b43cefa320d7e407fa47d4b2ece62f62a68500a0a5a601
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as part of a link farm or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dakhoathienhoa.net/images/files/pekekewamazozewobesa.pdf In PDF document text
    • http://phoiinnhiet.com/images/uploads/files/womapan.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/nugamokamalixo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/59497241659.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vejapibowuti.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/puwiluzoguletoketuxu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/26776382141.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/zonijijijemetafafiw.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/14648172482.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/15923210338.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/61483621924.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oeksrb6udqdg8e7r8tqd0the72/54590633158.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/besorut.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155727163ab4---wubelubebazu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/dakovet.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161523bf1976a1---24211895271.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vakaterivinawiteseme.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/kujugajujesulafilopam.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160c2f01532d---75435194200.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/84789910743.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/65810161740.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/86021592588.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf57b6d00a---84813382529.pdfIn PDF document text
    • http://ukrfirework.com/images/file/87862534671.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/45926391434.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4813bbf6b5ca37a54d21bc1f889dc0b7/gejus.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/237dfa89c693bb93f9244c957b5960f6/wojidudifuledegobugeketu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jogging+for+1+monthPDF 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 18004 bytes
SHA-256: aef38e9de732c77aa71e7a09f8f7afc593245f1d4d59f9d9153e809d16a162d7
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10196 bytes
SHA-256: a540db4722629cd61d2b5767fcc192bbf89d74ef2a8a408eba36905b70ee8189
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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