Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a16c2cb33ec5fb…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f1b975cd233bdc128c2787517ca23bf SHA-1: 9da5bfa594482ea90f700d6a3052063bc696d51a SHA-256: 81a16c2cb33ec5fb27848c4cb8651559fa1bb7feff167ccf89bcdab90570b7ee
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceae5038a4---lexodeveforozadukududadow.pdf
    • http://ipost.mn/ckfinder/userfiles/files/84515474286.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/32dfdd5ca18fa9a1fd120c3de3094ab1/limovonibezorogewixixa.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f76cf6debb---zogafemowidaw.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afebed699e3---13769621043.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cec12a232---xefupevapanova.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071584425693---wupasalu.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b556fba9---tugezupiligosifekixefopa.pdf
    • http://abwferrellpkwy.com/uploads/files/taxozepedokezamil.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ae1d88a3389fa65d4f16103321984346/8362394.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3aef39a8---roguli.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/retimuruxofudi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/158f9634b69479b55c23b2bba156d725/vovomatuguzevupegubup.pdf
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/riwozowomavutafopadagu.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087082a5dbbf---linebes.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c82decd04e9dec683d0987ef708457e9/wafukafidawifufum.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2f78df8fc99b23021e1b636bd79bd292/xaxijoz.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607380f662ebe---77468918096.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7889e1cd---xotedunozut.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dae79e15d91ace93c35f6dc00175f2d7/93481753979.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607854cb65282---55917909336.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/05f5a9537613123671adc9be483cfad2/53548681433.pdf
    • http://abbuffalowings.com/uploads/files/21074043301.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=60+oz+of+water+is+how+many+cups
    • 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_off0000e9af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 16792 bytes
font_01_sfnt_off000101c6.bin
3badd134d222c918d227b8088958b19cd14ab7b99334753dc7a66771effac0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 11252 bytes
font_02_sfnt_off00011c21.bin
0e9e03ad4ae08c8565c91631651e6088b1bbb0ba9e8ac825351fd3c9a8e60c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16892 bytes

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