Malicious PDF — malware analysis report

Static analysis result for SHA-256 582a76ff7c6bb394…

MALICIOUS

PDF

113.1 KB Created: 2021-06-26 03:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99281cad41f69a796e367f9eea00d074 SHA-1: eaa4e32a701f86224dc3cc802354ad870e1fb61b SHA-256: 582a76ff7c6bb3947470e6ba4401748cb50cd5ea5dfb21708c9ff9a44e7b341e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attempt to redirect users to malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.contectrade.hu/fckfiles/file/fidanezarolitobuw.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8706aea57---rogodabixoravaxoviv.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/wesukurot.pdf
    • https://fanaf.com/article_ressources/file/kulen.pdf
    • https://charterfori.ir/basefile/charterforiir/files/dosupanetusukejo.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/2cd7dab6d93e27d8a02f2b085c34cf11/gimevetude.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cuig5visq2a2m7624hl3cr6oud/63730930726.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608955134f582---bakuwofepokoxoduxavazazuk.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6dc159b---38245350582.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2ade2c8f---xuregux.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d82282c649505b805abd7904327bb954/memofexutivodaxebuninol.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/pelufadewiso.pdf
    • http://morebricks.com/ckfinder/userfiles/files/mapumexotaruwunatafifuxef.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hd7s8b4ege376o83aol066m9gb/vididebifinumaxedaxali.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qes8t9jg67rac6n5mdp3s8lh5i/kuxoboni.pdf
    • http://championshipsportsrings.com/clients/23492/File/7196254404.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210612045329.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608295715aa4d---90391930974.pdf
    • http://www.sudaff.com/pics/file/ketupoxuninunofi.pdf
    • https://rmp-familienanzeigen.de/cms/files/23698089213.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rjosjgcsaq6jkbp8tvoaf3fhpa/pubot.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80601bcfd---87807661912.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/db9f5bff584623e10f91aed9dee2f499/ketasawezemixakugokokut.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439810e21a---juwiwokogigogajewiwovod.pdf
    • http://cuspsurgeons.com/userfiles/file/zakanudi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pirates+of+the+caribbean+at+world%27s+end+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C28 16792 bytes
font_01_sfnt_off0001643f.bin
471a98bd80bacc6b9704c0709b55788e2642212b095bbf65e004c8aa9dad79b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1643F 10832 bytes
font_02_sfnt_off00017d3f.bin
0bb3d987eda365f17adc78d94b56d7ff905ecfbc18108c0e875a2e361b5f77e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3F 2100 bytes
font_03_sfnt_off000186ab.bin
00e7063b4fc81cdd34b5c08d842a4d06a0b817b8169978e9eb5a7833ca17ba79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186AB 18272 bytes

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