Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cd0df0d652db9a…

MALICIOUS

PDF

78.0 KB Created: 2021-08-07 21:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 08d4e08d04465c466521d1d35f33ce2d SHA-1: 1254ef98b440b8a306894b119a78d267696d9125 SHA-256: b9cd0df0d652db9aa6fb0c400b452254a5d9a04668b9663bf110cb3cc3231688
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gwardiajuvenia.pl/zdjecia/fck/file/39162191709.pdf In PDF document text
    • http://maszyny.pl/userfiles/file/43113217399.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/35926871925.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1ca4418979b47a7cf24b96163af41b71/sefijapejur.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/tatanuso.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vevis.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e0d3e33d---zaribomezalekaxomodon.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/neluxara.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gkrono4kdg3mcl48ghbkr6cr66/xopupomivuk.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/wazelago.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/59150905823.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea244356b---ruzekenuti.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878387b118a---bemevelisabap.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b738319f---77536394092.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aca7a5fcd---zuramugagigowepaga.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/53354892355.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9001f049---xikimuwededig.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/2551954535.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e42dd7dfbe5896b0be785db6467ae8e7/81402576202.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/60072057223.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/linugonefoful.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9c5cd0a5---tolotabozapozido.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/33213744008.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f073e432c36---gojiliwomajajozududi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=test+-+tarjetas+bender+para+imprimir.docPDF 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_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 10960 bytes
SHA-256: 5e8375cb17ebd69bb51b9043a28822443d23f9d876a7aeeb35c13c9700fd512a
font_01_sfnt_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17388 bytes
SHA-256: d4026d6332f97df926c1ada2072832a24dfe31d9c18ee5045cd58b01d6649360

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