Malicious PDF — malware analysis report

Static analysis result for SHA-256 215f773a4ad8a046…

MALICIOUS

PDF

99.6 KB Created: 2021-09-16 20:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 661ca4442d288418b5d060229cbb8234 SHA-1: c7ed1e50f3c0897d08b8825884a80584324eeb53 SHA-256: 215f773a4ad8a0460ecf97c16ded27ed044e99844bf37e6cb1df76fc8456f312
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute phishing content or malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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=hdmp4mania+bollywood+movies PDF link annotation
    • http://z500.si/files/65795906483.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/tagixuxopipigor.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/lubekiforovodinovazise.pdfIn PDF document text
    • http://saydersan.com/firma/files/25847785742.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/pizitudopizoje.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315accda3cb---53092714750.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2026d0723cfac1820f862b800ce9b9d7/93422948948.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/342e2bcf08fd046bc2dd5ff99d670827/96135260144.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/92534662829.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/3400006018.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613770cea0a79---tuxivowurekowikol.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/71166664791.pdfIn PDF document text
    • http://okvin.org/userfiles/file/saregatoxorasakilerid.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kaletumufozegodefiw.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/23964923733.pdfIn PDF document text
    • http://tzsunup.com/upload/rakabilegumexusami.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/tepufude.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/5703591365.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/5717360797.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jejifixoxumajitoja.pdfIn PDF document text
    • https://apra.pl/files/file/nilokakinekagopeg.pdfIn PDF document text
    • https://sadex.pl/fck/file/23831764722.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49472543055.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/30280168579.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_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10832 bytes
SHA-256: ae46e4f5950b251fd59aff03462bda80e0c2b323076611d8aea064ee99417b4a
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C0 18492 bytes
SHA-256: 66d6c235af505bc06753534c17d165926f991ad4cabc2d3ba345c1e01546a50b