Malicious PDF — malware analysis report

Static analysis result for SHA-256 42339d98f8b00d0d…

MALICIOUS

PDF

92.6 KB Created: 2021-08-30 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54881cb5889368cec49464a094c37dcb SHA-1: b46a1c372b53cda9b0f3d4068b01619274792c57 SHA-256: 42339d98f8b00d0de3c4876b186c2de5775eecc0e06f297d326806863a3b2821
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering attack (ClickFix). The embedded JavaScript and numerous links to potentially compromised WordPress sites suggest an attempt to lure the user into executing a command, likely to download and execute a secondary payload. The presence of embedded JavaScript indicates a potential for further malicious actions, such as establishing network connections to download additional stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6c9069654489f3b4d10c62faed7764e1/tufiserosakuwelo.pdf In PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/8700820595.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/bilinesikujenetala.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/78b9cfdd89dc41fbbc321d22bc76a73a/lunexugirozugaza.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zibuvunafoxufojom.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/nepuvitu.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/27071773950.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a6eb2e050d1c9a26d7e3c168d3274fbf/pajonemusozajotilujo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160812bc2ebf71---82245944315.pdfIn PDF document text
    • https://foulardfotografando.it/file/bapixej.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d01a7011fe---86200307476.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/90054169487.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/324ad677c30de3708fc5cbda417c3671/liwixuxanela.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127c17197b---44096334982.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/52812663392.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/59720494423.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/wurijamatiritegisuder.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611a13b5aedef---bidivufoxuziromu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ff31ac4b4a66424a3d09cfcf2b9f5d19/82190792648.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pulevuwoguwaruvijekoxasip.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840b3d487df---muwufope.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/xorebujujekulijesufolijej.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/bagonotuzikiwuminedi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/506d51601696661c256f390c6b7318e5/timinenafesenuretigewojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+nitro+pro+default+in+windows+10PDF link annotation
    • 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_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 19912 bytes
SHA-256: 3975725cb19e4573fa9d21ab17072b4ed09dd9eae923f38a07a7b5f1529ce876
font_01_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB9 11100 bytes
SHA-256: 31a48d119ab907cea34d0eec08e79820006271ecb62561df9beb282664632325

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