Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f61864843e1b028…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 13:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55dfc16169a7024f7d42f40c89b65519 SHA-1: d7d9050915fc9ffbafa41f59f4295533d1b827a9 SHA-256: 9f61864843e1b028b9faa446667685bb1dc217de9b1e62a98f21fc3b361787c5
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to other PDF documents. Several of these URLs are hosted on compromised CMS upload directories, suggesting a tactic to distribute malicious content or lead users to phishing sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm designed for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://clumba-indoor.ru/files/files/40240990483.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/lololunujomegapajita.pdf
    • https://a2designbg.com/userfiles/file/39785822583.pdf
    • http://www.emailposte.com/pictures/65685611089.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ab70c05308479778e0f7d41bed05d8e7/34259310617.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/23mvrvrvu2024icnqlenq8g2js/71362339185.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c4daeed60ec230bb5ebf9520a3a5e077/xosegosipu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a286e3a482f---xinapufewowimem.pdf
    • http://bisenzia.it/userfiles/files/12148087894.pdf
    • https://hosvagyok.hu/userfiles/file/56242650403.pdf
    • https://pharma-tools.eu/galeria/file/88661055719.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4ba86036c99a4a4cf901051fd4e968f2/girizovawod.pdf
    • https://businesslife.com/content/file/24790482922.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/af360f5936a90a4b2fa179ba2cdda0f9/rokixir.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/36562034769.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072735149291---147417455.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+hack+roblox+to+get+robux
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e853.bin
1ced656f454c6a3e2b0490ce8ab564308f2b7e8779b8cdec12f92932ca354b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 18476 bytes
font_01_sfnt_off00011767.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 16792 bytes
font_02_sfnt_off00012f7e.bin
eed55836e854909bd5973b0b9d2166ebfde7f802651ad8529df90559482a99ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 10908 bytes

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