Malicious PDF — malware analysis report

Static analysis result for SHA-256 415ce73967604015…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 21:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a43c07ca815c907f510f793e96db3ca6 SHA-1: 567100a50410448e2f4f54bf53c045f1fdb02585 SHA-256: 415ce739676040155236382c0a32b35a6780d8a278ac06e5b1e8d450cd45475d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of multiple URLs hosted on various domains, often utilizing vulnerable plugins like 'formcraft', reinforces the attack pattern of using compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705436eae71---zuxekimiripoxenebog.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a410fe62064---vemikolas.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3104babd---847733552.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d571bd6ccbb---gotagusedelatosorosewet.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6f059fh23rkhj38v1mgn7ajqr7/wogatozetoxapexipisaxus.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea78e6564fd9dba83e0fcaa3e91ab847/17622144357.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9ae4b3cc---14114408051.pdf
    • http://ff-engineering.com/userfiles/files/15947291339.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb67742793---vidodavux.pdf
    • http://pnmanagementsolutions.in/uploads/94377048659.pdf
    • http://jyjwqj.com/uploadfile/file///2021061817140163.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0348ac003---24137368099.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bebad98ad59---55253823893.pdf
    • https://prosperitas.be/data/assets/file/25429687057.pdf
    • http://alt-1c.ru/userfiles/file/duwefo.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a418e98a1a2---fadom.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/01589823d8de6fe1c507d8c5dbd5c66e/mogutapifij.pdf
    • https://bobecoingatlan.com/uploads/editor/file/59802502698.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/l984047fvao0bocai6s4fu065i/26499229834.pdf
    • http://coreaad.com/DreamDataUpload/file/faforomale.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a6c43af6793fd34d1a277fe503f2dd45/63776532113.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983d1e04915---47920879802.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e751816666eedac856cd73319273dbd/82567002594.pdf
    • https://accu-split.com/userfiles/files/wolizonemizemigo.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cjr7tc41govsm0p6ihbrcbsm4e/bawumemiwuzosulul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=competition+act+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_off0000e983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 16792 bytes
font_01_sfnt_off0001019a.bin
eeaa751f0690c80279f2c9db38cfb7087dd31cc149dc3c51e51b3be695f5003f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10500 bytes
font_02_sfnt_off00011972.bin
35447b504523802024d30b95057a6c6ac45db394393d5c8a1207e4c7da477304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 18328 bytes

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