Malicious PDF — malware analysis report

Static analysis result for SHA-256 0931534fc43266af…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 10:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4eaae29c00162ef4c1eb8e1d528ef8c SHA-1: 8e0a77ceeb899173d87e4e88f78c6b772d79ef76 SHA-256: 0931534fc43266afe6361eb4a456ca9bd9a6fe8daa7139a8b7d23ee767526b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://archism.ru/uplcv?utm_term=preventive+maintenance+hvac+pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c4f6b139e4ca892e53deb5a06b3626fe/87709655186.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r8o703mqo05fe7h5le02soikii/13496715141.pdf
    • http://candybeauty.vn/upload/files/47729488904.pdf
    • https://migger.dk/userimages/file/73228861053.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaecf2c543---66792395689.pdf
    • http://cautrucpalang.vn/webroot/img/files/kopevubu.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/40295732888.pdf
    • http://massintech.ru/img/outer/files/fopibekagukidat.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/pogagepebul.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8750ae4a6cc3f5010aeff49f9c88b814/xejilelasora.pdf
    • http://bandenplaats.nl/cmsimages/file/dusuxif.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987218d3c6---jorepetuj.pdf
    • http://illinoislivestock.org/userfiles/file/75338065857.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3327133957629ab03625b228c7446d6f/mugawodemukekasek.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315da2c5cdf---79806912642.pdf
    • http://szwygs.com/upload/pibote.pdf
    • http://bjdfszwy.com/filespath/files/20210814100613.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/28b7b3148914fd5922c73f20bb813754/98673483999.pdf
    • http://zhjpharm.com/upload/files/35557972825.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/52292721999.pdf
    • https://siltri.com/fck_upload/file/63387654297.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_off0000be48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 16792 bytes
font_01_sfnt_off0000d65a.bin
18e9eb8c2e4dfa03ef640fd73e4e063b79d7b8f9a57cbbf56b2c2d8cc53becbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16084 bytes
font_02_sfnt_off0000ff70.bin
601283fc6fa680541fe2ece6d2879c0d46ca31aedca88da97fbeef41e88b7ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10620 bytes

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