Malicious PDF — malware analysis report

Static analysis result for SHA-256 d720e2b461dffd78…

MALICIOUS

PDF

84.3 KB Created: 2021-08-23 14:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e4f28824952f60df28c48ceb6ca672a SHA-1: be4b33b6544e816eb9e9531f02002a3d4cc76d0e SHA-256: d720e2b461dffd78f2dc4cb22f9269da7d8f55765fcf420606abf50b1264f0c9
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. The primary goal appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=how+many+calories+in+a+white+wine+bottle
    • https://manuscripthandler.com/userfiles/file/tadasi.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609144972a68b---97179238049.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf253fd0---36120215233.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b707093f---92490307289.pdf
    • http://kppzp.pl/userfiles/file/vupijenekizenanomibamam.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/26341088881.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t74cnocmkmchlsj8917gku0ouc/52795452340.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bb904f32242ce64442e871f85d99454/kilubiwus.pdf
    • http://nsdadventist.org/FCKData/file/26446464848.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20df66d03---batobeja.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6009c40b3---35952664690.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5e34aebbichhr2muqb65ielvn/33417709262.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784bd5767da---nezamakudomodo.pdf
    • http://aaaexpressac.com/userfiles/file/zopofegebavetemese.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2fc7119a0aadfb3a09b518f6c55467c1/dibinijoxelulolisamu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff876db915224436dbce1cab8a776ecd/bumutolil.pdf
    • http://bpsstudio.hu/uploads/5334199338.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42369710217.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1142fdb6---74498012696.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3df5eeecc2446239b24aa62a25fbdacc/kukibusawufabofagufogibo.pdf
    • http://school19-zav.ru/userfiles/file/18202825322.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e375a613e6---dorederebibo.pdf
    • http://wixoon.hu/upload/file/43522272792.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/demexazogufebuvajodaruke.pdf
    • https://fetogram.ir/images/upload/files/17540898129.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_off0000e481.bin
78bc95a118001e7cc0629fc768716974a46a2593ebcb9dfbafc7f5e8350136ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 17212 bytes
font_01_sfnt_off000110c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
font_02_sfnt_off000128e0.bin
ecb75d8e3eb6ba7c3f21c6b7699c62483f5b2258b8b424bb4fb0c5cb1d730c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10828 bytes

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