Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6c562850a2b5d9…

MALICIOUS

PDF

77.3 KB Created: 2021-06-14 10:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeeafe007c29b9392e3fe75988766328 SHA-1: 0eeccb8d2c954b60ff4375634d27e493b0f58f41 SHA-256: 2a6c562850a2b5d97da494883a501bc1c07b37067a966146690a4e0e054a94e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The embedded URLs and the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://medvor.ru/uplcv?utm_term=explain+waterfall+model+with+example
    • https://artbynela.com/uploads/file/kokufoxu.pdf
    • https://advik.net/userfiles/file/dekivapozuvur.pdf
    • http://okzawidow.pl/img/upload/files/midazepini.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5d2a6fc5505ea3d292d64f088672a1b1/23678300125.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d066fffee6dfae805da381f530c56ce2/68599628097.pdf
    • http://nedirajtebosnu.net/userfiles/file/zatoporejavefopirel.pdf
    • https://arhometutor.com/userfiles/file/banapixaxevubas.pdf
    • https://luyenthitoeic.info/userfiles/file/nufoge.pdf
    • http://aqbnb.com/uploadfile/file/5387232012.pdf
    • http://nandeestationery.com/userfiles/files/mekowakusirixukiti.pdf
    • https://vieclambanhang247.com/upload/files/41232701382.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc88f35a4---53974913630.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin
e77c25513615a150f999b4c79f15a156f8a8edab63e1e317eaf89599edd64913		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5220 bytes
font_01_sfnt_off00010472.bin
e187cc3fc1db6bdb5155c98cd5ab1b79e880871a82e697116c4d0a1eed8f4b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 10608 bytes

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