Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26c9fc533244d8c…

MALICIOUS

PDF

82.7 KB Created: 2021-08-10 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1de60f769a7ef4ea855b0f065276e0b3 SHA-1: adc5f782c0ae5258231985f6db23edd89450cf88 SHA-256: b26c9fc533244d8c942e50efc9cdcdb9fd7e6811d28c5356a7891b7929cd95fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=idm%2B+fastest+download+manager+10.7+apk+%2B+mod+%28full%29+for+android PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/de9d0b3a25344c0a7fa279b3432d72b9/68808598728.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/862c1d58982bf0eebd489a9c4dc1ce43/punalilikumajiv.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xisifukuzame.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/kurewokoropovixekubo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8464ebed---lejekikelukuf.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/d806a6bd35e98180c5bf6324feda6527/94241096867.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tubigiwevujikirepukixox.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/kurejifafazakipofetosig.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/natepafikovapogisilidemut.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/484baf29e17c7ab08b5eed1512ec9b1b/82521446444.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/48456673827.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/12830930998.pdfIn PDF document text
    • https://wagaskar.com/media/gejufadaxinasowababor.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xebililedovodovu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6ce59b02347f0a1b2e1ec8b284e12cf8/kotufufe.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/27658985575.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/15474448964.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/koxosegaj.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/71135883340.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/s75k1miebplsou1gb15g6gnvqa/74868636339.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/vemotimijov.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c66004e3c---581474432.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/64285534741.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f1daba4c3---47085080935.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///1761049863.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611111280163b---dafesuluxazati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11516 bytes
SHA-256: e8b748bbf1f2d2473e591028cab1fbc95f37cb8a15cb68dcb5a6d0e0205470a7
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 17444 bytes
SHA-256: 243ab4bddb579ae7a6e4d2870c7cc53229cdc3118159b889bb28762ed6e6fc3f

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