Malicious PDF — malware analysis report

Static analysis result for SHA-256 a332702575bc5004…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 21:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce47cb0744c7e0e21e74d4278aae6165 SHA-1: da18682b44ed42288a30abbc9cf469954fcf68ce SHA-256: a332702575bc5004bd0df3eb7c5d63d32c2c4ec3eda7e321475bc5a1595c5ab9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://plafondchauffant.fr//img/user/file/85750020467.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb34232ccc---detakilolumetus.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/83814598537.pdf
    • http://geodavidepini.it/userfiles/files/6833367097.pdf
    • https://lawyerupsmart.com/tempimg/file/fezutovinurifu.pdf
    • http://yevres.fr/ckfinder/userfiles/files/67686076056.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/769ec25a03e558ce23e1a6e27eb8923a/80197007127.pdf
    • https://okud-istra.hr/userfiles/file/xudatibubidexajovuwivov.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/ruzedosa.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fajhvj05fi6rlsh51dc0cvfo0f/10460996920.pdf
    • http://ipoz.pl/userfiles/file/83361983085.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/nizigedazovedidewopido.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165efb2744---rejozalifizawa.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87b1fc4075e9ebf88ab83ebb95b3ce2d/18068121312.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739ab15298---bupavorokepafunajuguzi.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tutupom.pdf
    • http://seattleteriyaki3.com/uploads/files/libubamo.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/40818739329.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c677a35912d---rakinamovexazovokiwij.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863751db55---nemixojenupuvajopozoj.pdf
    • http://grimastone.ru/files/74712852975.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/17089808068.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c330a868b91500940dbdd4b4374b82ce/97342174167.pdf
    • https://taucaotoccatba.vn/images/news/files/88261997966.pdf
    • http://piazzademarini3ge.com/userfiles/files/80270156743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2009+subaru+tribeca+service+manual
    • 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_off0000d42c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16792 bytes
font_01_sfnt_off0000ec3e.bin
f221af2894e26e7d7bf9f4a275ff6121820e14e7d408ee8c1ed361f86dc36956
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 17212 bytes
font_02_sfnt_off00011873.bin
ff85d9233b92b1ec0cb52ca895cb9d9058764217723c665e44ee165068161363
pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10892 bytes