Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1341d285d6b7468…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 09:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9611844f39dece83bae5f838e853e47 SHA-1: e387a74880feab18e5042ceb028aa72de547c2aa SHA-256: d1341d285d6b746806c8a88d631630d9def40897c66539ac6d0934d0c7e063db
172 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. It contains embedded JavaScript and numerous external links, several of which point to other PDF files hosted on compromised WordPress sites or disposable domains, suggesting a multi-stage download or phishing campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://coretry.ru/uplcv?utm_term=advanced+manager+apk PDF link annotation
    • https://myphambambi.com/webroot/img/files/73711662162.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/sajepuginogido.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8eb674436---kodejejoretibuzoje.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/mevajajebafuzufiso.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zarerologut.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8d743c6ba46c7d938b7578ae1dece7df/pojijaxexunoduvedilupur.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/73754193475.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/17823630585.pdfIn PDF document text
    • http://ingore.cn/upload/files/rateramimapusogi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a7b26da5ee5524f3fa199da4b5708645/pudaf.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a6f3e439---kimuvisarafu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/70946400775.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/37356102393.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wiwupodezore.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/borifanunuri.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/20297554730.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/91629968572.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/23389196621.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/15562875476.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87808350123.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ginukobunuzidizetejibuwol.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/98150289536.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/95987799257.pdfIn PDF document text
    • https://lapdonline.org/file/wegegamorodugikobubaba.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_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 10472 bytes
SHA-256: 23cf4ad6ef8f955b66014b37942266fec169144f82e7a84e6f1bf97d0a466435
font_01_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 17204 bytes
SHA-256: 359459c381f8534858bd2206a563bb99a8f97ae463d6a3b71d2b49ac24eb5540
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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