Malicious PDF — malware analysis report

Static analysis result for SHA-256 02564ba82752211a…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 04:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b74ebd77e6f10b07ba18cf3f081f107f SHA-1: 826fc395b66837f17cbb296b890c3029e1e28c84 SHA-256: 02564ba82752211a85b21c8b12a06fe034367fadc75fe496958a3d5c14620213
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=business+card+designs+pdf PDF link annotation
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69986366982.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/56963197513.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kixowaxokoxa.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/fozaxikunofo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83415132b7---zutexoveresawoluzurejagis.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/35774304667.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3ghc49v9vdjp7va36v5dlbf5o5/6575911326.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rbaguh9cu2qrat6hnc0v31r3vi/25381998870.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ba648d81---legapebosabej.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210808172504.pdfIn PDF document text
    • https://people11people.gr/uploads/File/64279708511.pdfIn PDF document text
    • https://lbassicurazioni.it/file/90885637732.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/tedafagodagezonaj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b20190fb---87025554782.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6799348a58---birexobaxaluputizimulijo.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/sunadixukavopifizef.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4786dae4---96785773143.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be4aba63610---sojafowevusajerapaletexof.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/baxudoku.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0a06ddaa9---40823643326.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/4085535063.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/86416833397.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74592689005.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/12575896397.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767661b5961---xeromipinagipadi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 19220 bytes
SHA-256: a312a6cf5f55cd3f372cba12bd0b4134808e0ca73634fdb62691fa6e853c214a
font_01_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A0 10684 bytes
SHA-256: 4e4e0f2cc7916edca2d03cbe68089345fa891a8592580dfe7481053e02b6ada3

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