Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08eba2f6185eed5…

MALICIOUS

PDF

72.6 KB Created: 2021-05-06 21:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc1d69b775e5bb306e00952f2a994ea SHA-1: 0385fd2c9292172ed422c7c0c5ec377e2bfa44c2 SHA-256: b08eba2f6185eed5b61288206695ae7e9762cc91f4a287d139c21a684d8d80ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=armature+reaction+in+dc+generator+pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdfb2c6895---72378864592.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2e31cd8672b645a9f741f211cccb58c7/bozaragivoraror.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183cbdceb1---zakudokelipumirari.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb12b19d0---dotojetiwasaveragopa.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cce064c7---9587740221.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0b77382c570ec7002b0c2a37a18df095/jelowuxamovoteke.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607259085adb0---nanilenofopigifopifaro.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7e58dbe1---28280146786.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/31un5mt71eqak2esmga0i2ceuh/61934134676.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f4080b33---gubunoropel.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/672c4f9d650c2c7d354d9cca8920b608/jesalizigesufapadejagotu.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3b17988684cdd2863ad0646e252e8057/96723413575.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429185751657753.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10mh930pvm6rg215i3he1v53v0/munivotarewaponarok.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4643284e---notuwuzupovarugawirujura.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4ebd672d---lusigalivafulipoga.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607839fb1a675---61044585688.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e8bb818e6d3ac4783018f4d19656cb52/34187271001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e3.bin
faaa939c16b8cf6963088c915a37fc9dcdaa47bbb8d9cb1bdd022f1bcc3b6c57
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5256 bytes
font_01_sfnt_off0000f3ac.bin
37a33c5d7057e29e3c59a236024dcef37d62b413593b69275dd56763d40be095
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 10136 bytes