Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cbd7f85549bbff…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 10:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a62ecb876a24b58b14f51afbbe5e22ea SHA-1: a3882b2ae4183a7d3966e298ff86d6c9e3c2c808 SHA-256: c2cbd7f85549bbffe35ba9d8d37b96168d0974722e4a793686c3cb1214e0eb8a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ksboutlet.com/file/files/mipegimaremaxerexuwewuwa.pdf In PDF document text
    • http://safeabortionnepal.com/userfiles/file/41395445751.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wasixu.pdfIn PDF document text
    • http://qdjshg.com/files/file/88024486409.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/5376153473.pdfIn PDF document text
    • https://moolans.com/uploads/files/loxafomijajizebepupepox.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/80370866452.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35077649744.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fpn81m9j50p7tv29mdp40qdqp5/fuledi.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_060259.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/93056081897.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210917_DAECC94447F9E879.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/497676cd55868aa9eaa89b0a185c2db2/81175059605.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210907112654.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-13/20210913212635987096.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/60612751554.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/444434687.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/61439866249.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/766a403cd0d7ef1f1414c6c0bf6f39ed/lokolodatej.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343eec10053---vikejojivavitusukowatof.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72a92b5c5ee2ce9eb7f0d85cf6d31774/vukexofutipiporafipava.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fba3c61cb551b1f96ef3c01d089a3b28/fukelilefisedezivi.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/sezusuk.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fovorinogupusakogeweb.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/88288183666.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/44156894559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=house+designer+apk+modPDF 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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10776 bytes
SHA-256: 277cf609f1e06a7e9af9bdcbca6b268614b0535ef795d44b1bf0f25c7257efbf
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 18208 bytes
SHA-256: a77ee6eb499c662ae4d271f1ec1954f3ae852c8d30182eca57e333a82dc11562