Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21894dfd69f8a88…

MALICIOUS

PDF

288.9 KB Created: 2021-06-30 19:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a25706ca67940497e0b2dcdd596ac5a9 SHA-1: a3a345de4fd9b8950c572078761b95ab2303982a SHA-256: d21894dfd69f8a88ad8196d2a08797d69acc4a6f350f66644e01d863bbf5fae9
126 Risk Score

Malware Insights

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

The PDF contains multiple links, with a critical heuristic identifying a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 5

  • 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.
  • 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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/j0c3kqfqlllmd8hsqlgp3audbc/tonorifebigowiwij.pdf
    • https://artlabjo.com/userfiles/file/xekafafesodojixepu.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gupusipewavawifimuzaxovit.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6983eb5c108320e51a957c8ce1d72cf8/furepaw.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4091a7508d---fanefokirajupaliruwewofav.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7849c73f---bopem.pdf
    • http://meijialx.com/ckfinder/userfiles/files/5624533889.pdf
    • http://dotacjedlaoze.pl/userfiles/file/daxol.pdf
    • http://studioaba.net/userfiles/files/63006754929.pdf
    • http://sibmetiz.ru/upload_picture/9981245672.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/76007504878.pdf
    • https://emmaushuis.org/pages/423987642.pdf
    • http://dhf-china.com/d/files/mukagas.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/590a62bb34953e970982194a033e1fc9/1359134507.pdf
    • http://maristaslardero.es/userfiles/file/25678375539.pdf
    • http://kapsalonvogue.nl/files/file/rapoda.pdf
    • https://dichvuketoanvn.org/uploads/files/47335473885.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zagovax.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e538ec6797---38595999990.pdf
    • http://christopherspubandgrille.com/userfiles/files/fujawumonafafabo.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bcc479e178c8995a9c29653977e3991/xigilarera.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/71fd63761582c9d431d360868675ed88/56071604277.pdf
    • http://jdhs77.com/clients/58520/File/54485272553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=why+is+it+important+to+understand+that+the+development+of+religions+have+historical+and+geographical+context
    • 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_off00040fb5.bin
9f40c2883d764f0ca9751e50f66a379c44ba430ddf3806db4423b12e4a4f1e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40FB5 11440 bytes
font_01_sfnt_off00042a60.bin
ec6a5195515bae1822df3fe7a9ba981e4adbf107b068229fd86b5403a47fe8bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42A60 19008 bytes
font_02_sfnt_off00045b96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45B96 16792 bytes

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