Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3d64cc718e087…

MALICIOUS

PDF

79.9 KB Created: 2021-06-26 08:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 105b52e0df4fbe4a391101e5db0a3618 SHA-1: 634999f0bb225666322c45933894a1d0ca36888f SHA-256: 57e3d64cc718e087a36b33882541c18d17393fd5065d28ffb9019c7f543b4eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious sites, potentially exploiting them via drive-by downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=gross+meaning+in+malayalam PDF link annotation
    • https://prokoncept.hu/admin/blogfck/image/file/33408045962.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/185fd3fe9038c2eae03a07b2ebf4de57/94649413076.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/89289687408.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70db12d86---nevagobukof.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/situsebefosemezukononu.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vonomisamekapigeb.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c1fa36a88f5e493ddcf473eac26e2317/gujixapawivuku.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ee0e310b70b8ab17b95e3d95b04d160f/zinanomunokanezoxisu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c94afeec---duneregige.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8ba761d90---mudeposojojazi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/rogigotidevigotidebop.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608920e49be21---15449210561.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e726e91267---moxuvijajiligej.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936edfcd8c9---46303601013.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/85071879175.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caa7794577f---sapatetakofeten.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d8eff2843---mazufagibebokozuxiloxupo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tosofinevipadejazel.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/tifirasebeje.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2fe8f31b3---detewajazurojuxixat.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/806200659.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4b583679123c11eed0fad6d99afb98c/rilux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 18968 bytes
SHA-256: 16558028eb8715831414ab389e35e66dfa85b3fa4ee57a70ef7f4dfd5c947eef
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10508 bytes
SHA-256: cf9feaff875d5f3eefdacba5300d95449c34c32555d68770120fbf85e750884b
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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