Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e4ae56551344f1…

MALICIOUS

PDF

97.7 KB Created: 2021-09-06 08:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d5ba3202c84f9f05f67d1120220c7c1 SHA-1: cf8817353de55251b404cdd8a0446718feabebe7 SHA-256: f8e4ae56551344f1e1df8b0206ac636ff1c8c7ce9c6c0b3c05bace3721d2a4b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tcihk.com/userfiles/xemezijuse.pdf
    • http://agnieszkapawlik.com/userfiles/file/nivobejofusugosemiv.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5dd09215936669812b0eef116772c6f1/jefimifawesotafuxemefu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d12e67984---vupake.pdf
    • http://asupuro.com/user_data/image//file/92088227562.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/22797486693.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076314ceaa97---siwaxorinivupokaxi.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4441ced1284d971da3a71937bcbfbfa4/6887093744.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6135946ca445c68f1ffea73538addd52/62398875418.pdf
    • http://agapetown.net/ckfinder/userfiles/files/98872635727.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/98294843448.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210626_58F855267FDACF4B.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/37945291130.pdf
    • http://homeopathyhk.com/files/xafuxobekituboxopoguno.pdf
    • https://xebecdesign.com/xebec/userfiles/file/rosigatotitikilas.pdf
    • http://balone.net/_upload/file///46487361216.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/jipej.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4578f135ae809ff8e366a3f32b175af7/fabopujiwatowinuwaxes.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/diwiworegapofogexufa.pdf
    • https://atamergranit.com/userfiles/file/muvodume.pdf
    • http://hyperasp.net/userfiles/file/91881442405.pdf
    • http://scuderia512.com/js/upload/files/666034730.pdf
    • http://hangnhatbanonline.com/upload/files/48837673599.pdf
    • http://roxburyhs1987.com/clients/63080/File/midakagil.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/02435165c2f5935e7d1a2ab08ce85e43/53496140271.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/116c44d8d403fd516c275d4dbad808ca/76551427634.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whole+earth+catalog+1970+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_off0001186e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 16792 bytes
font_01_sfnt_off00013080.bin
b4044b50cf0deaa801611c0e6311b83bf3dd9cc54c3a7ff971c7cd446ea9d418
pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 17788 bytes
font_02_sfnt_off00015f34.bin
f89716c16baac09633a8b0d7102edd9bf722ab810248ea52ad7f4e967b55e1f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F34 10920 bytes