Malicious PDF — malware analysis report

Static analysis result for SHA-256 f618396121c646ce…

MALICIOUS

PDF

69.6 KB Created: 2021-06-25 13:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7ebc5c0d82f156d7b6379be71138c44 SHA-1: 5da0ae448f7fb50298c5187facf9f7066b3ce92f SHA-256: f618396121c646ce2169c6870ed63065a948c188e3659ed6af040048f00a7b08
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e33956a4df1b4745b6ab90a9c20dc186/gaviminewejoso.pdf
    • http://slsnn.ru/content/file/5585056171.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda6ce15f3---72204864782.pdf
    • https://memoservicesrl.it/file/xugobusejekosexeg.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/58746ea55151191cf9373c8f381d039d/11026071797.pdf
    • http://acril.ru/ufiles/files/74200268649.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c953c8912ae---susetuzatexaxegiru.pdf
    • http://zhouzhuank.com/v15/Upload/file/20216232059258173.pdf
    • http://orderkiwicafe.com/uploads/files/29812833846.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1605a61bb---20012738196.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6ado1sv0h3j3hkcb0ahpv98c95/37385653711.pdf
    • http://kientrucnhacuagio.com/upload/files/vudimadog.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/negogobituvizalos.pdf
    • http://habitat3.eu/userfiles/files/84380261590.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1b6310677a63f0cf2aa11415c7644540/47941206908.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/48ee35cb774906e0b985507276b5be3b/rumozelaweras.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=corporate+accounting+pdf
    • 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_off0000b35e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 16792 bytes
font_01_sfnt_off0000cb70.bin
001bddd396ea47b758a8b1378f5a9b8a3dbb35fcf9ecba1f52f494126cd78b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 14988 bytes
font_02_sfnt_off0000f174.bin
a1991972242f7a61fcc6f5678280284209720c4b4cf142536ee448322166814c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10712 bytes

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