Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09a1736d9c2472f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 09:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 331ceec8acbf3d0997f7638a0bc5be6c SHA-1: 8e8d9fb4ecfadd39c16c290ea8ffd0cac4537837 SHA-256: d09a1736d9c2472f347fc0a71ba4f4739969268842ac721fda5af1ed1a72742c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femotolon.pdf In PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/89525557667.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/majigupu.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/leferarisujaximimor.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/84003877163.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kuwijikubetiduwejizibo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4e32da4bfe2f73aad17324f7f168953a/vedefewowotekuzexa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb5b08b41---jilejerigeralo.pdfIn PDF document text
    • http://charontrade.hu/data/file/35297562635.pdfIn PDF document text
    • https://halead.com/uploadfile/1630738625.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/bafawobifimen.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kanilup.pdfIn PDF document text
    • https://pr-dienst.ch/file/fejira.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/53817706662.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a52f90a---zixemuxogo.pdfIn PDF document text
    • http://goldmustang.com/files/files/tapuzunimi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fe5112b38d61536ff501010af813a1c3/38399192508.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cfbc931---57524926518.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12359747737.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/14479378640.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/14600342375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=blackbox+call+recorderPDF 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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10288 bytes
SHA-256: c747a5fbbeb40ff1ca67b0d7f591a952de16df9acad43bf556755be8c6a658a3
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 18200 bytes
SHA-256: 57738c2bd2a830ce1f08ab0bb31c471517a8c65a7f7815d85f5e6ce149d8e7cc
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1