Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e837f4653f8b85b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 14:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3c163033d73496894bd5fe03dbd0f53 SHA-1: e38ee0615ac3bcfdaa833e7c66dd350b6ce4038b SHA-256: 6e837f4653f8b85b464e4a5cbe34dceb70cb798e75fbe10c50d4bb377f2431a7
196 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on disposable domains, with one URL pointing to a compromised WordPress upload directory. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://ychnjl.net/userfiles/files/72961088873.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/faxuxenorafenuw.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/73674945925.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/rufamimifowemoj.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/sebiwexutijafunosaf.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/44177774215.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd89f778d7---jumegunabozezenebuj.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/gakakazonaxabofupa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061d94acf9---pawopu.pdfIn PDF document text
    • http://vina2002.com/uploads/files/gunagodokafita.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/polutu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161425ec6a8274---7775280505.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/zelubew.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nesexosifibonedi.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/94595742366.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/19831604892.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913013138.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/11886197046.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nifatipusovedif.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/36083226020.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/3575866063.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/34928127635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+bypass+android+lock+screen+pinPDF 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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 17392 bytes
SHA-256: 622bb5a28f42ff8fd2bf15a9c611b668127f0ea8b4f7fe665322de357baaac11
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 10928 bytes
SHA-256: cff11d72fecd401b88cd9be966770bce3add9c06e21a9a6ea87a45fcbe508455

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