Malicious PDF — malware analysis report

Static analysis result for SHA-256 187956261d6e4a45…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 14:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57640ecf0e5efed0dd2d4ef821e2e125 SHA-1: 45ac426ba2073422493addfc143baccf7052e6cb SHA-256: 187956261d6e4a45b68cb3962518c8737d39a247c41d721c2f7253b1e80e09cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=x+wing+missions+pdf
    • https://hotelmitrutarija.com/uploaded/files/11261751729.pdf
    • http://daming-school.com/userfiles/file/6964219619.pdf
    • https://crbz.ru/userfiles/file/tojebidukefejolisawogaxog.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/folijesugowopa.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a49169a58---23850570739.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lb4d0tiot26mkiu1kfv84iep71/givegipabuzakivub.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7da9f994---93838249722.pdf
    • https://7mark3t2-7aya.com/contents/files/44506286450.pdf
    • http://miraesusan.com/ckupload/files/6630116755.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/tatinirujumipekamiguzadi.pdf
    • http://casier-a-bouteilles.com/file/39736189814.pdf
    • http://medeeatour.ro/mm/file/devakeveretigokezas.pdf
    • http://mebco.ru/images/file/64266587323.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/vugegurafan.pdf
    • http://hadt.vn/upload/files/29207687572.pdf
    • https://eletvital.hu/uploads/files/papemebigoga.pdf
    • http://ouhkpthaa.org/userfiles/55523666418.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141edebe6edd---5926146619.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/nalarur.pdf
    • http://gsxr.hu/userfiles/file/koxetukatovikas.pdf
    • http://koslita.eu/ckfinder/userfiles/files/pebizisobigipafotamuto.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/29320104669.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_off0000db16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 16792 bytes
font_01_sfnt_off0000f32d.bin
6bf874dfb449b0b5bd2b2836295ad3f1d9979156ef34c864c834022dadb74b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 10396 bytes
font_02_sfnt_off00010a6a.bin
3399bf3dbf1140ef88acafb9c6559e865fac44bb4c6f3594d63dc54330f28e18
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 17792 bytes