Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6519ec17eeef0cb…

MALICIOUS

PDF

90.0 KB Created: 2021-07-27 13:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8112c087523937f5c3ce9f787929a58e SHA-1: 8228b08e149a061c686574da936b0f23995d0061 SHA-256: c6519ec17eeef0cb1a5d86937e0e02847b30a687e463674142ac89beeaf46675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b22157d5---koponebave.pdf
    • http://bantinnhadat.com/users/files/dewojixes.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2fbdfacd---varopukijev.pdf
    • http://pp-aqua.com/userfiles/files/26547608561.pdf
    • http://smartcevent.com/clients/871459/File/4832864268.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/s0mucdmmqv8b6ra37rkobhdv0l/lujadabixowo.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/157vuv14mv53bqmpikqbnpbcj0/laratuferarotozobilemi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098de081afdf---41937836627.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j52vtqja2u079njeeerg695548/vopufujiduxijire.pdf
    • http://uniquecharacters.com/upload/files/29533490263.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb80f4e9f1---4479909565.pdf
    • https://migger.dk/userimages/file/woraro.pdf
    • http://stylekd.ru/files/nalumafisemi.pdf
    • http://davcpundri.com/css/file/32944601836.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/23101835341.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16203434825812.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1b2ffca469823861ca9f32b898f2b95c/mitinaxonuvasipuw.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/devopupe.pdf
    • http://absolutelyneon.com/userfiles/file/gereburoregopupexoz.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5165082ec---gunimodujexo.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae573782392---91581323012.pdf
    • http://ansing.nl/userfiles/file/kefamijoku.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bbc77910413f3044b66a690426d434d3/mufajebo.pdf
    • https://ctsgroups.asia/images/file/84610254548.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rafi+biochemistry+book+pdf+free+download
    • 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_off0000fb50.bin
34a0e6985f4a6685d657942373e27b7f2661abbc9431106e778bd50db6a28e92
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 11364 bytes
font_01_sfnt_off000115c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 16792 bytes
font_02_sfnt_off00012dd5.bin
ed11e7ab49475668cd0620db99f858b51df0f0332b898a9b3be37d8bda39ac2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 16800 bytes