Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cc63ba383f0352…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 10:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 838734f709e20aea5bcecc2c9a6b07f5 SHA-1: c8583af6bea1ed2ba988b5c9703cba0fb5971cec SHA-256: 35cc63ba383f035214177b05e035823ddc60965c8af7745bf53349264aac5209
172 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains heuristics indicating it's a link farm, with many URLs pointing to disposable or compromised domains, likely to host a secondary payload. The presence of 'invoice' or 'payment' language, combined with a 'download' lure, suggests a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jadever.vn/Images_upload/files/finifisarix.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/19545194304.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/58bb01b423533fadae94b9691286a984/30704880418.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/14480772201.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adae12ae17---silezutabilugegelizaw.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081b5f0aac4f---nemenevimofebufanizisu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62215bcf---reguzot.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/fewinagazuwarigeboza.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ignh58ivo0te99u1ur48maavbu/37488585498.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nikijerorigek.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48b3ee16---42033593458.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zulidef.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/67927097325.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dcda77a3d285897ef1113d4413aa93f3/55486362422.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161194da4b55c0---79807896520.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7e8250eedc145ccd738e2ed5464b186e/31198824022.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b56031b5---nowilezizoserajanixexove.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/15640082304.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/66452449160.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/69913078683.pdfIn PDF document text
    • http://royalgroup.at/tmp/dezasidodigigel.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/25279547217.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a246619296---xivawosa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607681b9c24e5---soxudedekuriziwizupumetof.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/9430369642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kotak+mahindra+bank+deposit+slip+in+pdf+formatPDF 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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 17844 bytes
SHA-256: 4ac1176c08a0a8abef59cf2ae521d0bb11e309c1723610ab960636a2ad27a5c0
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10984 bytes
SHA-256: cf378e8ce3d932006b0da3e9d7cf25a603c5e217ba157e9378513adec2de1ad7
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.