Malicious PDF — malware analysis report

Static analysis result for SHA-256 5411f7e52b2a2237…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 03:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff06bf11d30539d737214cda4a2dff8a SHA-1: 70e9608b56e04e97f52e8f6f87a5981a0eb27c74 SHA-256: 5411f7e52b2a223716a47eb1848ce64824cb5a9b0638b7a243eb3df415f1a596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically suggests this is a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised CMS upload storage. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/cfb4fd0999d377622cf5c7a4796c2b20/susobojak.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/on6fme4qkvhitl6qllgpj4saqp/88308699789.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ddfdaf39---sifomaderim.pdf
    • http://mmckno2010.zkosuchdol.info/files/fiwudot.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/momituvivumeko.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/di6c7vpbqtb36hcvob6bggtp8q/zojesebikubu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5de4104e---32948779553.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f3cde760d312ae6169fcfffad51429dc/73181632744.pdf
    • http://paillasse.hu/userfiles/file/90447209222.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ccb37bce---9852366019.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1c4fa15f087858531f6443c389a91cb7/waxutezagaw.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/12144ab8651e32bb3f1c3003017a021a/53967468943.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a83f98611---86138820754.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30f665809---52936704870.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sekemilofe.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160841134ea720---kaban.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e5eabdfa---xoxebevola.pdf
    • http://breakevenpoint.pl/uploads/editor/file/zasemiwulu.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b3b9dfcfcd8f4a19d7a452015593bb94/93118117101.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/lajezokiwutob.pdf
    • http://berbun.com/user_img/file/53661505091.pdf
    • https://noticky.net/akce/fotky/file/raketafesakulepizixasulan.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/disawapitalejixisegat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=marc+cherry+desperate+housewives
    • 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_off0000eee7.bin
4f3bfbc72c83c4d59b4a21d6bc5f80f4e66ae75f04b57e82c71071d5b8c467e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 17332 bytes
font_01_sfnt_off00011c2d.bin
a3fd14578d9c2e19803d540df0a85f0cccfed065cae00a84a6426ccdff40988e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 10820 bytes
font_02_sfnt_off00013567.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 16792 bytes

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