Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9204dd2d825968b…

MALICIOUS

PDF

133.8 KB Created: 2021-09-04 01:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c551ea721f1419382a537847049e914 SHA-1: 75b00ecadc5fde876b85e0fe63b91c731f930f97 SHA-256: f9204dd2d825968be6e0d13c4e0c3230ea065e2b2394213b44cf0a62e3afd3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malware or conduct phishing attacks. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=wei+wu+wei+fingers+pointing+towards+the+moon+pdf PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c567f6de---tiromaboveperokiwikawemom.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d3891cd0---16402658055.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c8b5e309775dc234aed3f23d5053c03e/pavobukusufigamizubi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/21239795cf9c2ee505dd420b6d578fec/fubesaj.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/85433142770.pdfIn PDF document text
    • http://hotechike.com/files/files/41823346197.pdfIn PDF document text
    • http://portableandcool.com/files/files/lazifamidinenapujarapu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4cd8a2ff---78915718446.pdfIn PDF document text
    • http://ombs.ru/uploads/files/57463311083.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/66737292321.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ecfc9f8009885def9738ca22e03013f7/90265396998.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160806ef31ae99---maxorodogaxasogukixazo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118c753d0c---13856016690.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/panofagogekaxeteke.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/24714523068.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/68146a9c73759529ace1c1ce500e199d/36660615763.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/3963460028.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/97123197040.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b009e59be7a---tavugesigirofejunala.pdfIn PDF document text
    • https://mszukam.pl/dat//file/14154696928.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2b53bc0a---70197705733.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f055c187131---88192419013.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d04a62aea263f1b324196ba1d6128d9f/rijojavejejaliwa.pdfIn PDF document text
    • 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_off0001a3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBDD 20244 bytes
SHA-256: 1835f388386da2aa92134fbaf87e32f7138590385db2bc4528c287112759d34f
font_02_sfnt_off0001ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF3D 11076 bytes
SHA-256: 91cbef15c7ae582f6e1cda0bdd1b07fd3cd4c81ddd777782bc18f88f70ee8cc9

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