Malicious PDF — malware analysis report

Static analysis result for SHA-256 321043493cbb73f4…

MALICIOUS

PDF

76.4 KB Created: 2021-05-22 15:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c9cd3a5f28b3a525df03b5b9fe25739 SHA-1: afb319fe912c5cf579ddc2fe8ba5a5b8c1575af1 SHA-256: 321043493cbb73f4337103b450a926adcbeda1b0ca4873fa899019f567a1d776
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f60fb5cf2de894a965443e8940d4090d/36578834722.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087ada8bc074---podoj.pdf
    • http://digitalpolicycouncil.com/imagenes/file/99247912255.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3b0d68ff3f57932e038c8241cd1ae649/74033710397.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a4e1013f40f833c236cc5fcc60181e4c/pasawewisazit.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071267ba6b15---bonip.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968de7f154d---wuvaz.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/cb9c18346f7e90d5b4c7237562521a39/10086763470.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/47dj5lk6gqh6bg9r6f2dcl4kvo/govovuzopakutotoxupo.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7729ffc7---92935063366.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/80619af99ae91baaa655e329125fc507/bokirozutut.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jofoxusefoladoje.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebd42534e---88312554333.pdf
    • http://wildpflanzen-planung.de/file/54826985213.pdf
    • http://nowyhotelik.pl/userfiles/file/14466844738.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0v7lhd938qeoa47ksdh6nuuk42/9786733844.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c39hsf5s52cgat8l8mt7qvefn/varomonutoforejataxujaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+identify+research+gap
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e622.bin
037db1cb2576df4f884ace7935426e6dd7ba890c019f76e82fb0262d428c27e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5328 bytes
font_01_sfnt_off0000f852.bin
60e55627360031aca8d261768b4dd0a7ac9ba66c1b45ff2b09ce531488a37e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10452 bytes
font_02_sfnt_off00011bc9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 4324 bytes