Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc35fcd585f77250…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 18:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0c876294a1d9b66fbaeed33621fdd38 SHA-1: 9b6107babeb6f8bca6bf5bd2a272b540b7a90648 SHA-256: cc35fcd585f77250b79386e9aaca1e411abc92a48a4eefa677d9f219934f5638
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6b059126---fadilusip.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad2d1193a---jiwewosuduruzig.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c8422d2322215f027b06724a8db956e7/kufijuxizuxavavigojej.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/butenexinibajefegivej.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108131937597032.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/79719557621.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/lawopinokubaju.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113232aa39ac---16660818435.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/mewapenuwijipegasufed.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/dugowibivilefugedojupefe.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/33289315806.pdfIn PDF document text
    • https://xistenze.com/files/files/46095806945.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/togewafezifov.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/48302751616.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cf0da7a6---jinuvugaxeduba.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161107299e10b7---37402529841.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/nulotigufux.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e832e0262---98226985754.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/xuwudisonomikujejikemibom.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9f38d29d06d870a6a6707b1d456f54d8/tajof.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/busifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kraft+paper+making+process+pdfPDF 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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 11000 bytes
SHA-256: 09d6d0ec415f2d5c00d629779d4df397e8b36acb15ae2509d10d2743594f846a
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 17940 bytes
SHA-256: 39bc3f08469babf1da83c3ef699c05501879706a9076deba142ca7c80a744cd3
font_02_sfnt_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1