Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aac5293295afa6f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 03:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e8fe3a590e7ed1eb9ed2424213d74ad SHA-1: 012da01d5df25ce7fedb1e53186654b4ac2fb541 SHA-256: 3aac5293295afa6f4c867842232a67dff091fcf6c57af83daa0a2b4e08284df5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests an attempt to distribute phishing or malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dunaweb.co/bg_image/files/sokoxazevufitine.pdf
    • http://virus-safe-zone.com/ckupload/files/vevobijusozelifimusa.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/94564907248.pdf
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210905_30572B6C6BFDD40F.pdf
    • http://www.valaisconsulting.ch/file/35684994725.pdf
    • https://5703n1n6999-6a55.com/contents/files/werexusuro.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d1ff2b63---tuxagu.pdf
    • http://cl-metalparts.com/d/files/61918245970.pdf
    • https://kovtec.pl/eurostyl/photos/file/selulugafepugorakir.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/faee4688fb24e5e0d942e1d28f1926f9/lofabofebegorazasil.pdf
    • http://nataliashishkina.com/userfiles/file/5857593079.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/47283846626.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/40376766580.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/xisibufubatubumok.pdf
    • http://mtjjt.com/2013/upload/article/files/210907025228286094o7tb6.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a7ec9f771---ninejazalesosufopogakaril.pdf
    • http://hanleyresources.com/images/fupudomudixusiz.pdf
    • http://agcslohian.com/userfiles/file/woxemewuvomonagowoja.pdf
    • http://mobiliteit.nu/files/malugoramerudipaduwuruv.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/19448287571.pdf
    • https://insp.biz/img/file/ketopifava.pdf
    • http://grandfiltr.com/files/file/lelaxilesinewekak.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73d36710---34067905769.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reboot+mi+phone+without+power+button
    • 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_off0000ea7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 16792 bytes
font_01_sfnt_off00010296.bin
293598485fbe659bf4f71677e059dcd12285b077611760289070625ed7b502b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10456 bytes
font_02_sfnt_off000119e4.bin
d4d42b088c20e63186dabc8044f9b592974ca666dd571ad563b1c5396e9b4240
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 18032 bytes