Malicious PDF — malware analysis report

Static analysis result for SHA-256 069c92f761c88951…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 11:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb70272ed330a4e0aaf4fa75b48c25e2 SHA-1: 3b2f28a8e2813122366536be37e37f7ad7fa4979 SHA-256: 069c92f761c8895147bbcbdbbf802e1d304401ee18a84560022f01f82d9c7052
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sterenstein.ru/userfiles/file/6652911951.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130403a5e628---buguboxep.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/15173940168.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/31935641812.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/72658455045.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e20950014---61677247965.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/kokumu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5069c5a94c---24371422162.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tijajuzogugekaz.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/14378818749.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bojoxir.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/jelesadopenitez.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/vadojowegir.pdfIn PDF document text
    • https://aedwea.com/upload/foto/34866427770.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/98781084690.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160748b5e3a54e---49752710142.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/59b57822a2b819e501d022a6be5077c8/lojafetakutuxodaruxowulis.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/30646818158.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/zidalalawibikasojar.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/zokarukowazu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fc449c02c8cf3d3925e911552ccb156b/362522102.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/79677816973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=glossario+dell%27edilizia+libera+pdfPDF 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_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 10564 bytes
SHA-256: bb44a020f50295b0a521ec7905b83fa7527c862933910fc4c47957eb7086f7c9
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 17984 bytes
SHA-256: 9a2c7f269f87fcb9eefdbc671938a998bef16ef7adf52442b2262107a939940e

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