Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a1c84e846ea7e0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d0ff1e069af28a1eb6ebae5ffb2917a SHA-1: e4726eecbf125ec3d259e87b5612e4e32dd32eb8 SHA-256: 14a1c84e846ea7e092674a1c058ca3315ab04d58e0107e9b1fd6d8aa50edefb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://oniceh.ru/uplcv?utm_term=web+hacking+101+ebook+pdf PDF link annotation
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed6b292cc---liwekenafafaboma.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/mivovemojizawozapatutaxo.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/losojimanexapibukikoru.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/afd6eb4f18fdcbb89ec359b9051fe6e0/gurevogikososat.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2af1a539---41133213740.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/083bbcc04db5cbf2619c06de6ea36fb0/70275165036.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/xafazaxonutegutud.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076820ca6db6---lotoneguzinofiluleko.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c640572c5b---82456705650.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe168e06f---98334789407.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae2d515206425a8632a4cb9a3f4ac28c/pogefupelet.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/1873843566.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/27617803048.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b366e99b6c08a7773d428cbd7ba171ea/kenapaj.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2aa4d7947e709ad62621035ff0edfaa4/22735782763.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/64499622214.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/4683673322.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3en0iu53fl62b12m4fe2mt6piv/38537102783.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/fabibomirejekevekuz.pdfIn PDF document text
    • https://manenshop.com/upload/files/50566320136.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/68532612844.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7f71eea8---xifafezasesuluwaz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13f41d66---tuvulebiradobugakumodetu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/16104675583.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_01_sfnt_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 10888 bytes
SHA-256: c4565e8fd0da0a54f574fb55ac6e4b2aefcef6ac6740fcbc316f576aa5f0ac4c
font_03_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 23272 bytes
SHA-256: 5cfbab66301a250f38ae4173e4b19ac7b9f75a1d8fed8220017de9130a8a743e

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