Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c6e40592fc2f3b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 12:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 819413325dba8b8bd1b61019ac736106 SHA-1: b9e09210a4600b7f3f8f0738194f83ab4eb1f361 SHA-256: b7c6e40592fc2f3b721966697eb40503bd1ddb680fe992c479cd8a8977211347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to compromised websites.

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://crewmak.ru/uplcv?utm_term=cosmos+operating+system
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613673c6992d8---92358721085.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b862b4d8fb---tenokemizapimesi.pdf
    • http://dainichiji.com/upload_ckr/files/fofobebaxozagatetuli.pdf
    • https://home-consult.lu/userfiles/files/gasitemu.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/49586153295.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/co0q277batj87e8a13ftsg1r67/37564812559.pdf
    • http://burattinojatek.hu/userfiles/file/niborivalavenanasig.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c637702558---zimimuxekosokupovu.pdf
    • http://automotiveenergy.cz/userfiles/file/fuguzod.pdf
    • http://accapierre.it/userfiles/files/20119779196.pdf
    • https://parklanehotel.asia/userfiles/file/12407473904.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/sefozusijote.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615356c36ee55---30278826180.pdf
    • https://jjpremiers.com/files/gomujofekobu.pdf
    • http://srtprogetti.eu/userfiles/files/95313906603.pdf
    • http://giustizianuova.it/userfiles/file/77012547121.pdf
    • https://indicaperu.com/userfiles/file/24328468675.pdf
    • http://ackerviewguesthouse.com/userfiles/file/dokafejewezotuzizebo.pdf
    • https://softwebstar.com/shop/userfiles/file/lumafobav.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161510bb104fbe---73495960128.pdf
    • http://vitanova-cattery.com/upload/file/49332716105.pdf
    • http://realestatespoznan.com/uploads/rusobixusidalonufo.pdf
    • http://magdrywall.com/project-new/christianbook/upload_images/file/89558866072.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/737ef7bb0855c1e523bde8903894e011/volunaveb.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_off0000b3f7.bin
a6240c03ade30573d808a1696e663a800dbb11a0366c46dbb5efcece53781d01
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 10692 bytes
font_01_sfnt_off0000cc81.bin
431a89f5b94c53234c9d8e136b2eaa3120db53a049548aefb43e6a3271eaa234
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 17928 bytes
font_02_sfnt_off0000fa50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes