Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc43bd3810f975b4…

MALICIOUS

PDF

95.6 KB Created: 2021-09-04 06:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8def23be829004a8cfc7bfeceb0bac15 SHA-1: b6e8803dd3bf6d9e0627c1fd67a4e177a755c1e9 SHA-256: cc43bd3810f975b4dd5c495e431f0426c4b676941f16559d7445b235e47d9045
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to funnel users to potentially harmful sites.

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://smidgel.ru/uplcv?utm_term=caracteristicas+generales+de+los+vertebrados+pdf PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/82694bc1434d2c78fb828a3943e2a118/72864487461.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jasererejibo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/499966be50ef03658d379b97812df791/suwifowufizininilozodewu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/708js1u3bstt6k63kqjqplieh9/bilotakegoresunara.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff14c4045a0---bofadevokefa.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/69085647677.pdfIn PDF document text
    • http://canvangdientu.com/images/file/jetojosa.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/lefofajunix.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/84497637136.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b31a6304---legutevogikirutomurunok.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v0jrmjchs6v713hh5ocobhnc10/76803693904.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/fiwukoralanet.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/73798060077.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a80r8011lch2r6qrs1kontg8qh/87360253533.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cafd669d86abdca0582cf9683564a50/nomufusofeviju.pdfIn PDF document text
    • https://successalpha.team/upload/files/73177135094.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/76180824879.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c100f9e0d4c---vazukelilipof.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/sedasutuwulalupulof.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vumibojapum.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/kiwasumovejedamo.pdfIn PDF document text
    • https://cartolmania.it/file/sexirofewa.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 11032 bytes
SHA-256: 389f97f24372ec13a5be5270b26f23136d4a84d724c698bb4e4ec2e4e31cde51
font_02_sfnt_off00013f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F99 19436 bytes
SHA-256: 786fda55084b8665c4e3b7cfd8da8016846ce5d55f40bf8c3dd1581048ab4172

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