Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5a72bb340a156a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 06:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15dad893fee23acca0b2e2b3df28357c SHA-1: 857c8eb33c90bf8c0ea3e057847988812e95f8e9 SHA-256: 6d5a72bb340a156aec15da5269903864c857504d8d1deff38e1566bcadbaf636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically related to phishing. The embedded URLs and link farm heuristics indicate a strong phishing attempt, likely to trick users into downloading further malicious content or providing sensitive information. The presence of numerous links to PDF files on various domains suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=cancel+software+update+android PDF link annotation
    • https://charterboatdeliverance.com/uploads/files/84867084814.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19091633389.pdfIn PDF document text
    • https://cartolmania.it/file/lezeg.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/66001344872.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/25900998382.pdfIn PDF document text
    • https://okazionche.com/files/69870154863.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022004131294.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/100454564324.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/95192250307.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g4gdolbp5eek2ait99s6kcm3n1/4001549445.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/57721276734.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402b26f2fea---bizukevumadutemaniluvi.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/gigaranogamodotawed.pdfIn PDF document text
    • https://aneri12.cz/res/file/buxumegojunif.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090612471443.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902050033.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/jedomijafikisoji.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xuzatozelazizalozifevija.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/34372206026.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/sivodu.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/takigimudofavikubetis.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/11967369160.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nowinanaja.pdfIn PDF document text
    • https://termofriz.rs/files/94277420778.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/zivukudaroranapex.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f7cc30d3---48958334651.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10832 bytes
SHA-256: f848a06e6a3e9bfc863c85104feb9f378163a736359f808b1e88c8631af1958e
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 18476 bytes
SHA-256: cbb2399785eb32f51a5f4ae462bce92b5ed17a75f692e87fc071da0053560726
font_02_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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