Malicious PDF — malware analysis report

Static analysis result for SHA-256 734effe7079ca1b3…

MALICIOUS

PDF

93.3 KB Created: 2021-09-09 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dfba64c092a7de2d220a60640057c32 SHA-1: 0f58c27a599dd1b89482c4a16880630eaca62546 SHA-256: 734effe7079ca1b3e2d104a30f71e541b115556ab1eaa5b8edaadc71ff169bab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136643798544---4575701849.pdf In PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/vunezenip.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/10b1fb0485d0b736ddea69d18fa6671f/36769011870.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/52415264324.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/79525788233.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/gi11cj7mioo86cn67kqks7gih3/zuzemofet.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/976032595.pdfIn PDF document text
    • http://honghuibio.com/d/files/78344896510.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gaxusunadafegik.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nivuradijupadexojoweje.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/67814420045.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/87804175831.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wujolosodabasobedefubir.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/natozozadizilozeroganuk.pdfIn PDF document text
    • http://schokozentrale.de/idata/45692044213.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dojuwogufonu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394096b46b0---degexalezawabififuxife.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/48bed3ea7359650202379e04445dd092/30189805384.pdfIn PDF document text
    • https://aedwea.com/upload/foto/75380811012.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/04614b46539491733ae0379428b86f6c/63807272004.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/28633826839.pdfIn PDF document text
    • http://alkanboya.com/files/file///70137131301.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/jimepuxigave.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/35331908438.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/24305294655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chess+iphone+android+cross+platformPDF link annotation
    • 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_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 18188 bytes
SHA-256: 1e6bcf4da587d4593aa45fc1efd87aba85f525c4e61bc71790204d57958d6566
font_01_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 10916 bytes
SHA-256: f2a720944b847526793c048b824a50a22265670920550534bd2541f4890d5347
font_02_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1