Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f87c597bab56365…

MALICIOUS

PDF

81.3 KB Created: 2021-07-28 00:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1aa2fb44cf0e0a692930e1c6253f329 SHA-1: c6b1d9e57c3a30245aa38d61eaf4b805777040eb SHA-256: 2f87c597bab56365bd35d5a9b4ea269570790d91aaf9589b677b17cdfa2d0fda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised websites and disposable hosting, suggesting a link farm or SEO poisoning tactic to distribute malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate it's designed to lead users to malicious payloads hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spy-military-labs.com/userfiles/file/68497627790.pdf
    • http://atallmed.com/userfiles/files/54489241227.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5fb1e4b2d6726f5c1f7e3ab4c859182/mutozedasiperiraja.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60a1a8f0f---34838819166.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9270088981415bd946b02b98a5b61d21/vinefolejimaxujenofaxa.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607918f0e48de---59326745140.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d59e4855617d6be9bda4f6eb0db006f4/91558884284.pdf
    • http://sanphamhanquocymy.com/uploads/files/77923696623.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/u057i52euhjb4sb2pqiii8r90v/11441335003.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/96343433039.pdf
    • https://resonanceacteurs.nl/userfiles/file/lojuwutimasomu.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbf69bbf4---16125601045.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089510f2a18b---gafepeni.pdf
    • http://asiavent.com/UserFiles/file///pejoxiwitokowexokidorus.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hte0n2crq9v15ikn4fvbl941tm/95030294242.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58804a663---76774230615.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/97ba760d54111527727bf945cf57b51e/13608882484.pdf
    • http://belgium-ex.com/images/blog//file/sotisux.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9dc262f2943ab582ff6daedb7f3b326b/23889720188.pdf
    • https://rzfmuhasebe.com/userfiles/file/82541189700.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/varizatisuwoziwuzuvinenut.pdf
    • http://ebslang.net/_UploadFile/Images/file/30219778501.pdf
    • https://agrilaui.com/userfiles/file/bivefumo.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad95a8b3e---36600290440.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7h69jvh11napa16m0vei47383m/nomozimazaj.pdf
    • http://studiocariola.com/userfiles/files/94339849360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=railway+ticket+booking+form+pdf+download
    • 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_off0000d8d5.bin
b3662c33fdc4f23a466bc0b9ef319a252d04bde0672582a960c33b66465351ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 11272 bytes
font_01_sfnt_off0000f2e7.bin
13e8f6ec28dd685f0680cda23ef1381d9012d6247b2143b6c989f7c2484997c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16976 bytes
font_02_sfnt_off00011f76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes