Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb10d8944a9e78…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51f515ac12f201498c00b56af7185136 SHA-1: cb4a23118162ca94011cec53ef41a216792bafda SHA-256: a6eb10d8944a9e78460126731ed6214353b25271165d793d1cb59f0283da7a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://wastran.ru/uplcv?utm_term=watch+the+avengers+online+123movies
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7658e333---wikipoxoxiterube.pdf
    • http://hotararicedo.ro/files/files/nuderuluvelububosomipunuv.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8550d03d---puwofunijuga.pdf
    • http://harrisonsfamilyreunion.com/clients/62911/File/75275956093.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ae72l1n8if60194vomt14g3c54/64251939478.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98b63223c3c0e5682f54d04f0a0e44f0/65818651335.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f89b4d327ef789f0b4ee7f16ee08328e/18988579078.pdf
    • http://www.asap-recruitment.net/upload/file/48968902783.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a265f81b540---62655309308.pdf
    • http://medicapoland.pl/uploaded/file/fawubigaribizap.pdf
    • http://xycrusher.com/d/files/zisumekesojevulumu.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/maide3kf8rhul0192vup1u8g27/potijofexe.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86303358f---16629771670.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/zowafawoperuwawemakowo.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46df61929---zatumejetin.pdf
    • https://agrilaui.com/userfiles/file/87758146177.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8bc5caa9---lagozav.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b0a2bac328972a82e1a4d71cd185c6b9/56892833080.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7e6a4cfd3466bf7abfd3ed6ce7701fcc/wukegomeren.pdf
    • https://markmont.eu/editor_uploads/system/files/zolizam.pdf
    • https://noddy.nu/images/file/59537413076.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/18863282616.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607955a02f730---wuditeniz.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/36hladc9a91i8f6ck1nd8euag6/46398656412.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc79c3a23e---96658567717.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93f3cd72480a46012a8c8a9949e26e25/68891456262.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec03.bin
9f16a64e7c325657d4f8e02659a721e6529f0f0c46dde8ce295851d9e08597fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 11080 bytes
font_01_sfnt_off000105d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
font_02_sfnt_off00011de7.bin
a5e380164ef58f8c2f2b13431b3a30743153dbfc5b16510dd97f621200c46403
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 17572 bytes