Malicious PDF — malware analysis report

Static analysis result for SHA-256 395da20dd885a1f5…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 14:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5fd367f8f8cd47da8354f11983f670a SHA-1: ea90f69181c5bbe74979b182d935eda9fb5ffdfc SHA-256: 395da20dd885a1f510c8991fcc911a3f390b5916da39e2ad473505efc2c5ce99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, a common technique for distributing malware or directing users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6c12e4c3a08929ead4d6b7b06b463caf/30913112532.pdf
    • https://x-software.cz/data/file/13935031626.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/afeb08761e74cb5577a5d9dc40e8ba4b/96734671846.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072dac6b135e---57542667897.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1ad8da97---tapusigokumu.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c610d2c640f---xupiwirixugosizawad.pdf
    • https://diedacorporation.net/freesiafiles/file/24343410862.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc45e0d49---pobuw.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a970215a18e---tekigurin.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/lipukufelepebi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f8fe4e72df828212295548ec0e7c19/fafarekusefidamaj.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/937a69377b171e1fbaf58c92a9041d0c/setikowalogesupesidezuje.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8986d871c9---73843599731.pdf
    • https://thaihoanghung.com/upload/files/selijexawixiso.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d96f844a456cf2f7fc53f203583f0361/fojabatiloluzokexuzuxepar.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/808141597.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/reaejdkduaijockvil2dkqskbc/89206890024.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904e2488446---kizezoweruwora.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d7090b176a---fivezike.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/13565683444.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1adfebb1027be00e36e6a881c3274d7b/66207328497.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072e584ee982---45675986085.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1ogrgh2mtk61lg923dckbnd4e2/mebobuvowamakegid.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d85fab6b9---betozinuxaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=body+and+soul+lyrics+sisters+of+mercy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d382.bin
953065a185610b88b25a964190f06903efd8f77f1133ca3c19dfebbe1ac7c085
pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 23196 bytes
font_01_sfnt_off00010b4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 16792 bytes
font_02_sfnt_off00012360.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16228 bytes
font_03_sfnt_off00013948.bin
71757175c72efb3532c2d3b068c52534293f22015020956ba49cd6510c8d5ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 10904 bytes