Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e603af9d6471d64…

MALICIOUS

PDF

68.7 KB Created: 2021-09-17 14:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e61fe8b0064d1aee8dfc29f4ef8106d SHA-1: 98c826d4415655311d28fe8a3e4d6963e907a8b8 SHA-256: 3e603af9d6471d640e392e6b4ea636b712a1106aecec4bf2ebda3e7aa683bc3e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing minimal text and relying on an image to conceal clickable links. Multiple heuristics indicate it's part of a link farm hosted on various domains, some of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://dichvutheapec.com/upload/FCK/file/61062472554.pdf In PDF document text
    • https://bluza-shop.ru/content/File/xoxaxorepimulibu.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/60024130172.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/20172351022.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/nulegesagosazebesel.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/9532355867.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xupejupewuwalavep.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/67505527083.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912164812952186.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/fupabataxotudaz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/35939553553.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/joganexil.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xurod.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a1uorc470vuvovaic2jgpmn7d5/3765634869.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/33199870502.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/36725145914.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/86571669460.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/bijasa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614209f35a51f---pajiwamesew.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xegebodusulod.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/88387107993.pdfIn PDF document text
    • https://kham.vn/userfiles/file/14510765762.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/77660801437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chota+bheem+speed+racing+mod+apkPDF 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_off0000aee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 14236 bytes
SHA-256: b248b1ec9437eacac5eea474913c3981c1247314523ab7257cad27f878818214
font_02_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 11176 bytes
SHA-256: 375f7148d836eec327932dbea08dfce42b384ee34293be8ede1a3fedace280c5

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