Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe61d704fbb9723…

MALICIOUS

PDF

85.9 KB Created: 2021-06-18 05:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db4d435f57020f93bba70ba284453633 SHA-1: 81fc2a78c7b523801f6603015feead2887f2ce2b SHA-256: 5fe61d704fbb9723f6abf9a105a6c347f35367bca5ad85a9169ed2bb433bcbb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content via these links. The document body is heavily obfuscated and appears to be junk data, reinforcing the idea that the primary function is to host these external links.

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 http://alhouti.com/userfiles/file/tawuret.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/090b7fe666ae0ab354b6e1e97a2aca92/63409291674.pdf
    • http://architects-desk.com/uploadsfile/68792801110.pdf
    • http://cedule-plachty.cz/files/file/gorizobekikasalaz.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/dec8b627a25e870d1663a7683ca8a46d/lamerugeretijonuwinugap.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096adc1378cc---79461610549.pdf
    • https://aawyx.com/sites/default/imageuser/file/sebudunowaxefuzu.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abd3981bc---rufirazokuvajodixijo.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd0fa4f83a5f8dfa3a90e23120f3ba6/dukewutuz.pdf
    • http://kfbi.ru/content/file/nasowipegefef.pdf
    • https://amatnieks.com/pictures/image/52492122183.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/bojanuruvitemexovekevoduk.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e4eec2bebfd759c04e38046b5bf0d1b/kavitufutizevewajaf.pdf
    • http://global-leasing-management.com/uf/file/dolafabebapu.pdf
    • http://botosani.ro/img/uploads/file/jarovuxiruzabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=python+programming+in+context+2nd+edition+solutions
    • 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_off00010d72.bin
f4963d0320fdac424dd16856dd914d0c77e335cd0b096d919cc452d13f9c9cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 5788 bytes
font_01_sfnt_off00012111.bin
c2d9748784d14702cdb6433bff6bd86272ecdd100ca606fe4c2a74f31fb0d3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 11828 bytes

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