Malicious PDF — malware analysis report

Static analysis result for SHA-256 067f91214a668bfe…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 22:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8d451207cb2009cffb64b57201f9fa0 SHA-1: 6bd74155058bfab2dc3628453da4efac1ab7b82c SHA-256: 067f91214a668bfe6c98f32b349b5338e1d1df994c3c4f8cff2f634e2df5c80b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple embedded URLs pointing to compromised websites and potentially disposable hosting. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to phishing or malware download sites, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/uplcv?utm_term=501+verbal+reasoning+pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/nituvowat.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161320790b1071---34768861156.pdf
    • http://camonetinternational.com/files/file/29656417956.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84ec428e---97258529223.pdf
    • https://rkdestate.com/userfiles/file/38946504189.pdf
    • http://mycoapaisyl.com/webimages/files/82421250322.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d266aacc---49102187232.pdf
    • https://mongolia-volkslift.com/uploads/files/lobatineriwosizeborajon.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/5824229386.pdf
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/fizegegadivuboni.pdf
    • https://budgetparking.ca/admin/uploads/file/jitominijazumuranawu.pdf
    • http://szolnokepul.hu/userfiles/file/fimuwelotituf.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75969907475.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/ponategojogejor.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/werexidexaranip.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/juxadenurukobu.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/81131044907.pdf
    • http://sgpeo.pl/users/file/14790878724.pdf
    • 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_off0000bac8.bin
fc834a65563e3e8093086b4a54938d678db37524287ccf3e9302e95ca6be8fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 17700 bytes
font_01_sfnt_off0000e897.bin
c7e1a1715d36a31f8ca9d255da4473cb566ca530a0aeaf413751a3e395602f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10992 bytes
font_02_sfnt_off000101d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes

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