Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e61a984d675193…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 03:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8a73467952b78e85d501b7bd31f1a58 SHA-1: 0ac7e8595b2ba877f7f31242a6995058597421c9 SHA-256: 84e61a984d675193e18334226111a0ffb113b4b039c53155ba7e44bd20d4dbb4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://szwygs.com/upload/totekapozaweb.pdf
    • http://ingenermarket.ru/userfiles/10765919791.pdf
    • https://alakharia.com/public_html/userfiles/file/78101090000.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cb9def1723---dejumir.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab59344a1---57118371844.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4be45db295d0cdc73639e54a827eaf98/vixumasikidezuroj.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb605d91b---31999877851.pdf
    • https://baxsporthorses.nl/userfiles/file/degiv.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5399f49dd10a8ddccdf827bbf5246f9f/laxetukarekamasinumepuvi.pdf
    • http://pospatrans.cz/UserFiles/File/67441008523.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bta7etonn5mmaf7jsju79g8uh5/rijepufotepe.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1305963ff21bc8f240e7f8870db58c0c/63163252031.pdf
    • http://ulrike-mayer.de/userfiles/files/silafejis.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/66nj075mb6njukinmbrb5q5dea/84468117380.pdf
    • http://akcjonariusz.com/UserFiles/file/sekuwuvetixivez.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/95864990607.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3701fc3fd6---72023779186.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vikexukipifafodo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609f152162e88---zabisomarile.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7th7g473er9o3rjco63p7vp9g4/80979277879.pdf
    • http://yilip.net/userData/board/file/gogimiponibiwolew.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2f1cfth105o6kcanavvlocatm5/11193893304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vector+analysis+problem+solver+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e712.bin
928d747269093dfc4a7d8358e020c99a6791d2edc9db93b9bea97ee8b44a47fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 11072 bytes
font_01_sfnt_off000100ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 16792 bytes
font_02_sfnt_off000118c0.bin
9a56680fede5a653db0e176229746313f6256b249da88c54aa8d30c413776163
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 17352 bytes