Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f85ae0a1d56631…

MALICIOUS

PDF

81.4 KB Created: 2021-07-03 19:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a9a3cbe9421308667c2534f6a909b5e SHA-1: b63eb3e0d15c19332d6e5666cd50e4cbf5270928 SHA-256: f9f85ae0a1d5663158de0bdafd55fd2dcf76209d64de60f2b35fdd733558891e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple links on disposable hosting and the use of compromised CMS uploads indicate a deliberate effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74dd44de4---ronelisalogexi.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/luvomumitovon.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef4e0c38b---wosulutajiwajefoxonorudo.pdf
    • http://sendedianqi.com/upload_fck/file/2021-7-2/20210702045441865675.pdf
    • https://2acontractor.it/images/file/mefibawajewit.pdf
    • http://arqing.es/ckfinder/userfiles/files/tadokuwabalabigikonazamor.pdf
    • http://aliglobshop.com/userfiles/file/nusog.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac305286670---44667162172.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee51ba917e---68185633874.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/gomopijijisejifakumowevij.pdf
    • http://gospelinamerica.com/clients/874377/File/xisusegaretew.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb727691f3---nujobipumakoparit.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac53340cd5---93486729755.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c542c55a6---92553001438.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8acb461f2---dajomixudive.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/12429758326.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f219bce2---viseserolagape.pdf
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/2161104494.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1q5fc7kk9nc44aqiu5ju1b97m/tologuwu.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/nutaruwadewud.pdf
    • http://ventilatoryzlin.cz/images/file/76448804998.pdf
    • http://abpaluso.com/upload/file/52476362414.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d36dd9612cb73ae2c78d1c484b53436e/vivaviba.pdf
    • https://keongracun.org/contents//files/jitenelovujafuwinepoxafo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ansys+workbench+fluent+tutorial+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_off0000daf3.bin
660a98bdfa7d1d961918ef9a3882884cb7f83bb5721422423bfc3d84bee239a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 11232 bytes
font_01_sfnt_off0000f519.bin
64f67f9426417bf340fcc02afe0902f0de6dcfc7e9e60adba31945f53b6b36f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16528 bytes
font_02_sfnt_off00012011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes