Malicious PDF — malware analysis report

Static analysis result for SHA-256 408d020895284edd…

MALICIOUS

PDF

109.5 KB Created: 2021-09-07 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6394e8d4b607b51739632aeafdfdf168 SHA-1: 119463ad3564240212525c90c2baf5fb579b6735 SHA-256: 408d020895284edd41ab6c3776ef6d1fa2e95188c87015bee80377b2703c3003
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=physics+2nd+year+punjab+text+book+pdf PDF link annotation
    • https://knurussian.kr/DATA/upload/files/202107222129128521.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v7cn616h5vaib4mf2egr3cf3je/90181589385.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/fazepoxenizororudojo.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/60582147614.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/684ce0a98d94da810551f427aedcfdbc/10297879495.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/ratenodidupojakebena.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/gotelilanudojazinos.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/70806069656.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d2daf3ae0f1d0c7f55615d9a5b18c6e2/13424640012.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/43334565405.pdfIn PDF document text
    • http://cmtsport.com/pliki/68077449730.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4d82b2f1ff5f937802ffe800f13ffa2b/51761823002.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/govirerol.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8315b3ba---8341123058.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/brhqb846mvp1enhbkqtdqroam3/jupufibolawowevi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d04a44c8bd---pakimu.pdfIn PDF document text
    • http://fedime.org/imagenes/xoseku.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sgabp7qlo627ks0oh1g13o1hbn/jaboku.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/93633632415.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e05b8713ba7---mexawino.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/69646713162.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_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0E 11468 bytes
SHA-256: e086e842cba2ca98cc7632201818a4d94ad60efdad7177f7bcccd62362420b3a
font_02_sfnt_off000175f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F7 19208 bytes
SHA-256: 64241ba5b700ed21f4c08c14c7e1071f6b1510f034595f7ef6e1cd8c1beb574d

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