Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d646984d5a89dd…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74cb70dd067f756cccf9f45bd8fa1189 SHA-1: ad463175f27c821569f53f3b6b35a9f8348ae741 SHA-256: 35d646984d5a89ddedb1a3602692885c8370b7602f0a2972061ba8c7dec2bf20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple disposable hosting domains, likely to obscure the ultimate destination of a phishing or malware download attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myparrotfood.com/user_files/files/pujojexadivik.pdf In PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/xifekez.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/nopixavafuxoxelozenag.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vipame.pdfIn PDF document text
    • https://somogyplusz.hu/files/79282207316.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vd9sg2vn54mnsvjn8o556l7dul/gelutisadazebapir.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/301146d14231b72ed08e7342bb60c02f/kopugab.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbd889e50---litonujozujefekadudu.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/62122527614.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/35302109872.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/pudeninarisuver.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/sesexesawusapunugez.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443cb5c255---saxopeved.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tufekemivi.pdfIn PDF document text
    • https://viecmarketing24.com/upload/files/89033499452.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qmjqd22r9t67sqkvu9qc6vsrg3/654800558.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4df22af9---kezopenabovevasaxigolase.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1b9c013b7ac03a35d537785eff6b7996/zadunutugarudisojozu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc8fd4d45fad8c9dbf6ef34f2aa365ad/badeguluro.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160735b6f6e8dc---pekope.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/sujunutula.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095426bc065f---lidesiwizaxotabewewejime.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/92629824263.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/16iu8j9uf00rtk1u4brquro4an/12784466793.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54077ebb3c---20551267353.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/ximixokataxipajurexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=greenspan+basic+clinical+endocrinology+pdf+free+downloadPDF 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 17200 bytes
SHA-256: 3b0a7ecfefb1b19ef655e8300ee848bc9a919d4dfba7c97ae5e588e89a5a5e1f
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 11076 bytes
SHA-256: f0533dd6d2a8e7ea6f5a05240fd686150eae5c4c50116f08fc7963c2e97ad290