Malicious PDF — malware analysis report

Static analysis result for SHA-256 785da84a47d694cf…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 17:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a6f325f39dfd105d635d3e7b845f1a4d SHA-1: ecb109d7611137e41178f1ae9209f748e3627da8 SHA-256: 785da84a47d694cfe40369c5ab504082b6f7df9727c8dc64329d9a450d7b3f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

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://archism.ru/uplcv?utm_term=manpower+planning+in+education+pdf PDF link annotation
    • https://nitdgp.ac.in/uploads/userfiles/files/xekiwozexov.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/54746605070.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/364533c0ce1a482d1a2cffff3718d63b/jalopoz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0d5f0afbd---30096029001.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/93491855823.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202108291624542441.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/029d1318f2442588bf44179a85f4d0e0/kaxafikonutex.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/79025012045.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/58828911355.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/69527657019.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/76522496327.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/31017768002.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9621d9db0745e058c319a55105c4a3/63699481662.pdfIn PDF document text
    • http://homeopathyhk.com/files/79799760671.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b6c87bf8fa1eaee88a438235ff4b34b4/xosofatuxasab.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xerugob.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/gitodiwatufulofipesot.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079d04cfff---59373571676.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdfIn PDF document text
    • https://lapakunited.com/contents//files/votofemapumubuxinipekege.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/5159472705.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15465440082.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/wogaxi.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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10808 bytes
SHA-256: 8ba8e144bbf3f564d6dc2e956d312f993c076c73467e6c76135b8546a853c08a
font_02_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 18264 bytes
SHA-256: 022a086991a48d655f88b5ace8f1d60c4b031e86683a4ccc67a3a062cc8d8013

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