Malicious PDF — malware analysis report

Static analysis result for SHA-256 7225f90744c8614a…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 22:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbecb2e2a218bce499f4b1f891526611 SHA-1: 0442e788eb7b153deac65ef6c91f074831408594 SHA-256: 7225f90744c8614a678301a017cb59f5865d55e8b1102768f35074fb0a1699ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing and redirection behavior. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4654db8e41---lepenimezewifom.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/kitoviruxedixi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b96b7ddb7---xikow.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a202d2121a3---4717216730.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/93263107929.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524f28e1d2---nivopesipekolojeb.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6391760100.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8fa3f01aa45a48d77af6681c5e740d70/75198733666.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f5eb9df---48776731839.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/99e335da1b2102bc469a89ccbb7ed9b0/71700622887.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/6990656167.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb4e727d0---lidatorewalukiwivok.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/82128160797.pdfIn PDF document text
    • https://longhoang.vn/upload/files/83803442885.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ga5vmj1u4up7itks4avkd9tsmn/59838011593.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/skggspkubb03bdq8f545lrq811/87507921330.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/d7k6ht9ba2gt4iv6kn7hc4otre/nivotudonuzofufawutir.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/zebobasofaturomuju.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97e9d7a28---33952405343.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/45680848683.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/44793153160d8d9266a999.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe47be834f43ad7402f0eca7f2f8e132/16521650584.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/42502721972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ssc+stenographer+question+paper+pdf+downloadPDF 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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 11304 bytes
SHA-256: 6f81f75d7383e78e45364a240689f0f044ad828badb20de07ca74b4979252891
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 17372 bytes
SHA-256: 8cb4dc86ec480f0c3fb44a7c7d6dc1ad331c54776894b7dd66c146ff34bd2930