Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7306cc4bf2e9035…

MALICIOUS

PDF

83.0 KB Created: 2021-07-04 01:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15d5da7f31e6e4a96c4f6f4c1aa66446 SHA-1: d594dc3916667fb2c33019996d05e70a321ea184 SHA-256: d7306cc4bf2e9035e7116030bc5bd8ad6e442fc418c95fd7d1fbe0ba9a04db65
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The PDF contains numerous links to potentially compromised WordPress sites, suggesting a link farm used to host malicious content or redirect users. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd60c2889---besatapamaximaroka.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/16gj47vdspcov62keoi07dkse6/76944267082.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b846547e980---nadopofojodiz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7194lcpetm7f9eiedgcugbom32/popomun.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719c1aa37cd---zirok.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/51072116868.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xikaxekinogijozusamaboxor.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zudomos.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/98459607566.pdfIn PDF document text
    • http://centronegozi.com/public/1767469822.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/25124865998.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/84079653484.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b92b3603---sagoxezugafesugi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/87012425539.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/mevegugenafuxemedidab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10da71a5b1da503fdda948339df4ffde/62987553426.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ub4ibp6620g8849u2ohgbbv01n/sivelekeka.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aad710d362---dikosisesuwijujox.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b71f91bad---95968767341.pdfIn PDF document text
    • http://haai.org/upload/file/90319099828.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd701ac7---94412994996.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/taxasilosoxitubidipe.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757811c9feb---24514449166.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8b5e25b3---lukarinebalajun.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd38343f4f---88894791346.pdfIn PDF document text
    • http://0930actress.com/files/files/92118381854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+mkv+video+to+mp4+online+freePDF 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 16884 bytes
SHA-256: 287a54d8d8dc2f5e557cc1c74166040245b9bb2b7f31ac657e4098a5e4892f9b
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10596 bytes
SHA-256: 954e0c95d3515e923b252c471be55b236f55a8783feec24f76108f83cc4052b9

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