Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc43554168f8312…

MALICIOUS

PDF

75.3 KB Created: 2021-05-10 06:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa17867d24dc93c383ba15e69e6696d6 SHA-1: b219def0fdd7d5019b1a8e018e19020257c2840c SHA-256: 5cc43554168f83126bf49e9b6d5c24f05963ae5d73c25b608d9f092884c26fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall heuristic profile points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=blouse+back+neck+design+cutting+video
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/shpqaiuve8lat125rkfhhdjp55/xatagelupabifup.pdf
    • http://netinflux.net/userfiles/file/59171535187.pdf
    • http://arunimaflavours.com/userfiles/file/78192353015.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ea5d137dd2469b2ae54389aa1881ad81/maduralotumaburuzagukat.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b02f655---konokedizoberurilamupogok.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/98e282a118f51906adcf9ee63cb7d513/9212427947.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a519656a9---jopuxijavaxenubogewuwu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6811e3fb7---73046816144.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6a6def54---fowezevebixalademu.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/dca5d7c0435b2781f3742847f7dd6984/53308587274.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713cedd8f83---66424078270.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb638d82cb---zaloguzuroganopepajadavag.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/58448755283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin
b4e6139448a1b327f1de24f42845b47437c207520e8b2c81d24e28554ce900c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5324 bytes
font_01_sfnt_off0000fc9c.bin
30c0c2e7ea1d9f7d077fa83899b203642d951cfb6640d8fc5ef02d03c6a8642d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10516 bytes

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