Malicious PDF — malware analysis report

Static analysis result for SHA-256 af309302561f7659…

MALICIOUS

PDF

72.2 KB Created: 2021-08-29 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0391ee925145f9fe620507322008ecf6 SHA-1: 062b17a51199916a473e7413d59dcab8e79418d4 SHA-256: af309302561f7659c0a590ac31454659aff05d5e5f28b08b77c25f43bf5848fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of URLs like 'https://inwebjor.ru/uplcv?utm_term=confirmation+letter+template' indicates a potential lure for credential harvesting or further malware delivery.

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://inwebjor.ru/uplcv?utm_term=confirmation+letter+template
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d693be175---lujuwelazudexates.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bea632351bfa14bb96b0b23fa4c31b1e/riwuviselukunurasolir.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/potaxofezanazek.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d1a6e7be17b117d30bb14aa99961008e/31825280322.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dt0769s61t6ui1oaug6dmc53f4/74196612553.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210728020641.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d1777296e---62404769642.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/623466e8a357141239b08918d7f66c99/37514421187.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84eb128f5b---72258865927.pdf
    • http://lawrence-spruill.com/clients/42275/File/62042705685.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a930883375b---6753467310.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ddc7135e2cdad18733686f312c86414/niwejazimajitetumatenig.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160962c770cfb5---roxusuribibig.pdf
    • http://bioscipublisher.com/files/upfiles/file/rufawukal.pdf
    • http://poexali.org/static/image/_u/system/files/gekugitibotemugifijos.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2fbe88c76c2462003ab1a5e97f7a3e2/30314341784.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e67fbbc01fc---niwaduvibutelepipedura.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6da6a4678ec24c39aff1c432e3e7c9b6/67575079619.pdf
    • https://ms01bet.com/contents//files/batajexidexafixodun.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8af7a9a2efc67532b3f460d9c2b84e66/13348342975.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0cfbb76d00a5d1f6963baa528b054987/5171643170.pdf
    • https://subded.org/userfiles/file/kuzitetasafudubalarub.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/woveboruvaxo.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_off0000ba9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 16792 bytes
font_01_sfnt_off0000d2ac.bin
cb53ae98756d3dff01d7dcb8c4cb1475ac27829ae47dc1c915e09f92575a97a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 15468 bytes
font_02_sfnt_off0000fa0c.bin
c7eb5c0e28892f3535037fd259eeee052384d5704666c85bcb26415d03173a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 10384 bytes

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