Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2609875754e5340…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 20:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d063446b8071de819abbd3d8a121c59 SHA-1: 0f437209bd02a601f0ae892cac5c4acc4b6ae80a SHA-256: f2609875754e5340b5e027dc9a0f26ec014a115afce268ff418ef4b967065f8f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking a link. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yourtruck.be/upload/ckeditor/file/nuzijutefuzufulo.pdf In PDF document text
    • http://henca.com/files/details/file/2832446566.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/vaded.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/xonogifazigogisususipeba.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/54476786022.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/2294228326.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/fenuzofokedopatuxowim.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/pizukoxejomabagevojoga.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/8210683101.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613252380d96d---78338001859.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/getadumozamewujegu.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210924105653_bxxla2.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/jalefe.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/novutob.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/mativijotivodezuteka.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/bp8461ilarlil4apr6e0vrm925/81541774055.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/regutan.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/224121a244b9e556a25d227fd53194d9/12761243674.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df3b68b74d---xiwive.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16130ee68728a6---dozokeguran.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/86050069230.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rabobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+video+converter+for+androidPDF 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 10456 bytes
SHA-256: bb58baf914f7fe1ff8233c3045dc101754765f6856450f1fa7d6ecc80f563c42
font_01_sfnt_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 13988 bytes
SHA-256: 6f2b1abf9b98b6ef40a32f0f00877f9008ffc9bdaf7a5c75f8a0a8363e318b92
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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