Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b60d56a82699c5…

MALICIOUS

PDF

102.2 KB Created: 2021-07-14 07:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c2bb73eebd1ea781eab2fc4a83b7424 SHA-1: 7a92f7e589e97ce21fc003987397a658cf2941e2 SHA-256: 34b60d56a82699c5c9ea0ffd49bf6f164e8cdc44769a40c8a9732d403e84e4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely to lure users into downloading further malicious content or providing sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f569e3a1---32881647089.pdf In PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a97c35940a8b99fccf54aa365dbb7983/98895074942.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f23af989---korifimutetedavav.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/11dc97d66e421f0d7dba7803c735774f/gibugamopetijixujete.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f1f5131d7dcea8901c258b7aa13233f2/zidusubiwu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50391553549.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/lavuwano.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/13453564049.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/sagokekif.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/99376671134.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/27772827072.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/173e0d5f727c30afbc047a52ce367dd5/laralefugiforapewufer.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2105a6b6a---rofojoki.pdfIn PDF document text
    • http://bronia.org/userfiles/file/2797372838.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hl5kt2132bhsunsu2l0dgf9522/rogolejuze.pdfIn PDF document text
    • https://autopratichesas.it/file/fojamuxajilig.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/825ec666d77338e08b2825bc5df5f0a3/31259727786.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tatajonezosalemonerobesa.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210713080611.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822bf0a716---jevesojemisaxukedawi.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/junex.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d866e943af0---pumapakapet.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4ece8e2bbae852ea6357c577d3e89844/xowulixusap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fundamental+principles+of+the+metaphysics+of+moralsPDF 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_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 11076 bytes
SHA-256: 0ec81de761cbcd8a59b43105875b5058d2e1964fd2d6c6b9f7e1694f351f9ef5
font_01_sfnt_off00014460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C72 17988 bytes
SHA-256: 51e656feedf2db16e6efc34d29e113b6e02f4fdf7113a55474b2ce9ebc5b3367

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