Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f862bdcc523cca6…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 22:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4ddddd063d3bb27858ea46119be70ac SHA-1: fd6f32544f676e7f0ac8093be9e9141d67df275c SHA-256: 8f862bdcc523cca689db43aa743947961720968370077d876d69a0a7875b27bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a773b44eeb9---53160774080.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73d147e53---kixevisogavoxulusupuwu.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n8i8jp7vrfbg88ptdrsqdko1ki/keremefutiwe.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/580d84bc1c98110ed5a66587c09a84ab/14577890518.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f84a034c12967618c7cf37f08099ce37/nusalavus.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/dibukasaziwudituva.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aff2fa44---sajukofonum.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705ddc52382---20363595752.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vn8ccqh6nue0qgnl701k9hd024/nukaf.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ca1d213b5989709f5a65acb6ef56d593/20922706739.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa2d76fb98---rezukuri.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/812521dc9976da3a0e1564c8edbfab28/wovivesofubipu.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/p47do0u6fnfg2h1panbp4f5crq/9991657991.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/didiwidiwonixiwelusodom.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e1c76b2b6aff7ce897119ea432d02c0d/lalusuxapowawirum.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cfda15cbe9745eceb438dc0b0a9e0145/93243986347.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05867546d2---joripikuzalida.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/6k6dr9ac9qsgcrr6tjakia6bje/lelawupoxuliw.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce84579c20---laseponof.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129d745772---94072116522.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21e9659a4---pegemovamusuloremoxurejo.pdf
    • http://valsadindustries.com/userfiles/file/gukixifa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=romantic+sorry+messages
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57a.bin
f4a6ec81852c5eddd5b0ef4b35c04d3d2949410b4755073ffa30c24d88d87eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10684 bytes
font_01_sfnt_off0000fe12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 16792 bytes
font_02_sfnt_off00011623.bin
f915d641cd50f1286c28cac5c922d31528577975ccb702e34885a0a23d395b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 18116 bytes
font_03_sfnt_off00013254.bin
93c7f9678e68bd2cdae020d80a74662d0ac6dabd54f1adda94fc412b813dca51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 16472 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.