Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3c540afc0b69c1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 10:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c760260eabda2be765cee92c1c99b7b6 SHA-1: 7720c546f2f7cce8ca86a834bca1b85e205de002 SHA-256: bd3c540afc0b69c15f044f09132783ac2b3032059466bf8d5ccf0875c219024b
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites or disposable hosting. Heuristics indicate it functions as a link farm, potentially for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=iso+17025+pdf+francais PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/32837d9f6e462f4c4432fcbdfde71c92/kafub.pdfIn PDF document text
    • http://dgjst.com/upfile/file/55138140751.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/74792750476.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/rogadoj.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/wivefavosurezu.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/e9166cca8c216b56af71f56dfc0acf8c/vezitozo.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nekiwidevi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/13548277eddd3f968df61c2d35c294fd/duzolebekivobikonovomuri.pdfIn PDF document text
    • http://retailcop.ca/files/fofijizu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2f37bb26211a40bcf2d5d15fb001e5d3/91350122613.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/23399380738.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k6f2veekcrkpsebmr6bhq3nmct/73167861491.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/fudadobuginod.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2f94cc9d---wumono.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gomowadipugid.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a776d1cba---fazidujaka.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nomaduzikexideximafux.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160888718d0466---datopuvubarabiron.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3bb5b514---gixipirafu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052519192996.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac007221cb9---duxevepomapipawubefig.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a784e11f---pudenorofaged.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10768 bytes
SHA-256: 6912dd9f12977cbd8e31eaae8985fe94ab865e31064bde70dedac088624e7b4e
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 20128 bytes
SHA-256: 4b146198732c5adae58ad97a9681075b8295f1dacd5416a3ca896ba5aa8e4642
font_02_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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