Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fe65a83a400ff0…

MALICIOUS

PDF

84.9 KB Created: 2021-07-30 03:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a72f0224bfe5cd3cf3d49d0888ff4ced SHA-1: 44c707095c6e360bea51638c8cab11b2a1fc80e9 SHA-256: 01fe65a83a400ff0fb050b8ad284a3fb54bb1a2bbfb84a2b71319f3cdb5dfcf5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing pages or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to abuse search engine optimization on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://solidpractise.com/files/userfiles/file/3207393198.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2937426c7---venizenemitoti.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd35beda178aa1b5179348d1afe9f2af/dolinatiwewusinavavi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fusimadof.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xarobiwanofusezusovi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/98226264286.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah3cej9bug606abskmmfgv5qc1/93778297326.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/4462037046.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984833b35cf---fivapuneradowezexezitodi.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/biguberukaragurepora.pdfIn PDF document text
    • http://chromoink.com/updates/file/venunewaselin.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9b81ec91e---39142201693.pdfIn PDF document text
    • https://masihpt2.com/contents//files/6074284393.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/82457140922.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/53b9q10m66th7ath6610hg0bj2/4815828769.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/92462243362.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a7045e8a91e0b7cd0d89519139d8d270/41372550980.pdfIn PDF document text
    • https://lemanssrl.it/file/tabudi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a64a7cff8---79262235892.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/xupanasukipod.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d187b417213---96357027239.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/505ac0f8618eda073a64818c36bad64f/zafavavoxorigelujaximekos.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cuanto+es+2+pies+cuadrados+en+metrosPDF 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 17600 bytes
SHA-256: 3109c9ce9e0baf4df6187bf7b3b591338d722f969e9b0a84cf87a8dbcc3e30e7
font_02_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 10880 bytes
SHA-256: 721811605655bcf4b406b6ef5dc93423d47c8f99122b22c6379a47c834f34c65

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