Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d64e66a440b62f…

MALICIOUS

PDF

83.8 KB Created: 2021-07-25 08:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3e0fff8c70f99678b7769f8c9484ae0 SHA-1: 3ec93043c67dca2a59342d7366696ef48427975b SHA-256: b5d64e66a440b62f392e3fa88c12d2ecfd9baf8b02bfbbd8ac8c49d57886d71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, suggesting an intent to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://fouladsazanco.com/Upload/file/bakebaperotadixagiru.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7005aab925---75076738244.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/65dc8c97843f47dd4c9cf7fe41dee66d/57748378114.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ticc6qql5ljqbac3ulg5plfs71/84879044558.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/xuxowexenu.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/93946294075.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/870fb393da0678104520711c0840cf14/ganegereg.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210701193402.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/89156686042.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/513779f7ae7261d26b4373e530788383/bivegavikew.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/femolikedesunebetiteraj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3cbe07d60dc8c2447bd548955de1640f/ferab.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/89188705116.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0738e67bbdc4801b5e3c26f55266ab32/66367546358.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/75308791069.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/73565540452.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607585b04267b---73424437325.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/59491662770.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/39949754943.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609593b7a37d0---sagireviluze.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3993828095d57a59f62bc1f578b5555d/44153379431.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/79764223450.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7c1ee741---64491236437.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11417817---18649962354.pdfIn PDF document text
    • https://shibbirs.com/media/files/diboxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+you+get+player+spawn+in+piggy+build+modePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 11168 bytes
SHA-256: 8a09a1dfa66010f9dc1fec943683afa1befba7b1448e738ecb1a1f41e3bbd897
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16408 bytes
SHA-256: a5d4afaf99b8485115c3b92807ef35c17a59a9467e4c7efc2f7c3e4bb6b79b56
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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