Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cef36398445fe7d…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 04:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 569bf57adb832ce21a69b21ed23d2570 SHA-1: 49f87a5016ecadcb7ad783d875a721b3ecb90023 SHA-256: 8cef36398445fe7db67b14e7461e0f8a679ab58afb376f7313e48df0ee6a49bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chiataiec.com/userfiles/Proj_Name//files/domubi.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/47af23660e850bf2085ce3987aa20ac2/38817352278.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lu2q7u5i2o1a4rhh9mtu2p8ni9/loxilivobekamuramugaf.pdf
    • http://yjccnc.com/upload/files/rifopejexofegexid.pdf
    • https://argekaucuk.com/nbg/upload/files/12034010768.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eae3488998---vujibujetujab.pdf
    • https://anmimar.com/royal/userfiles/file/dojomuvopadewikawetig.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2f8301de---83146783654.pdf
    • http://riph.pl/userfiles/file/94011394558.pdf
    • https://prawobrzeze.info/userfiles/file/45012530468.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jiwux.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16079007e03f45---79076075800.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dbd08b6e79dc8a6070bc5c871830c639/jewizegaxupagajatumeza.pdf
    • https://tese.in/ckfinder/userfiles/files/rabixivezawo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68cd793154---tuvikubeforitupo.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/bugezizijurawofaki.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c4da486a289b5c357948a6b5a5661e8/donomulobetuxarovesuvujok.pdf
    • https://clickkedai.com/userfiles/file/velorevuputagif.pdf
    • http://smn68.com/clients/75339/File/tisabejebelurotoda.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/89577255141.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab298e75fd5---44718738398.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608550b800a29---vegonu.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5c725f28bc49cf24dbadf08fcd722c2f/9544501155.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/a2om6rou46fvhn802d9o6adikn/73803667828.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dynamic+and+stative+verbs+exercises+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_off0000d75f.bin
fdeed7aa738d021e61834e747fbaae25c4aa76e24f4e3529ad1751b35e1ae741
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 11036 bytes
font_01_sfnt_off0000f0eb.bin
5ad8379e62f89af7bd290b9d9d83c94cd70808c61fdfb5aaf6308b820e5f8016
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 18220 bytes
font_02_sfnt_off00011edf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16792 bytes