Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f60af535238113e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 23:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09dff15db241ab4c0ee0c026aee511c2 SHA-1: 5b3492b180fe53273ca725a5832fb79a52f2904f SHA-256: 6f60af535238113ef6ee3c76edfa3e09456a8c8f0270d458dd0ece1a58f31d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious or phishing sites, potentially for SEO poisoning or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=adjectives+worksheets+for+grade+3+pdf+with+answers PDF link annotation
    • https://allcreaturesinc.com/files/files/48689464135.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/16186136898.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/veritag.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/wipidalejefam.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/diparalupuda.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/96537423562.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/kodum.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kufeji.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ea2f551822c5c9541200b94edfff7dab/73886911244.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0622dd06a8ecdc650469f1c1ec5f384f/17073882216.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/52486195323.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/xadewar.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jatapiganubufu.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6fd02a0f8b6cf2c0e5f8454f19740fb5/jupogax.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/tibupuzobo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6155d9eb---10418547848.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/65382622990.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b014cfc9---refisalufidajozuvanekad.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/51303609309.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/131e2d77a1fea38e20a470ef8a360666/32544502989.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rsh48da1g5dhdd1e4bkl27h8ek/90278456162.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/fapidirexiturodirora.pdfIn PDF document text
    • 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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 16508 bytes
SHA-256: 4a8559895d5118a4125bd87a698008938eb1778c49e0513c04af397d4724bd2a
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 11380 bytes
SHA-256: 7b48b34e557804e4c7866540ac09b01b1f0a918585a08f941279b918e17da569

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