Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94a9eededc7a81c…

MALICIOUS

PDF

77.5 KB Created: 2021-08-22 01:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 234ebd5faaf31843af69b7cd9ba96938 SHA-1: 2292ca6c521e9317cab3cbd0a75aa2eff9f87d71 SHA-256: d94a9eededc7a81c9b06775ea12aeb23fdc1a24cfedaf32827354d9b683b6356
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those associated with compromised CMS uploads and disposable hosting. The `utm_term` parameter in one URL suggests a potential phishing lure related to game exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://synerhu.ru/uplcv?utm_term=lumber+tycoon+2+axe+dupe+script+pastebin PDF link annotation
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zarolubuzekivutiwenu.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a102922991b---revalifedogedidemo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/aha72h1l2c6209trevha4ml312/zoxalomonixikugi.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/30720358035.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/32316866463.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1762dd8e---82950344026.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84151e14d---13545559545.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c7626b51b6b38e249d4b6c1907ef7c6/tanupobuvekasanoludi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2b0898962---birigovat.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/gewobum.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/080bc4df8ce3fa22c4f5daac97ea9512/tarevenoganod.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tuwalezeguxamekitilin.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611f532f1e0a9---nilikudo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ga98ip5pid7ihpv3msuu0jigj0/wiruzasumakobepeg.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/45335722686.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/demimulovavafatusejara.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a004a3df4---49304399132.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/120c14fd7cef447bfbd92a992365b532/13384164758.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d6b26a4d---xutenagikaver.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/73934142005.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d272014a6d2---3898553020.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d042d7ce---57429056781.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/jibufek.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/744fc5944deef08436b616e48603ea61/motojajope.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/pofoxaboseravedatirobojem.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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 11164 bytes
SHA-256: 32378d15f08a54b16a2cbe5b332506c99bfefe387977cbb5f1e8380c8e2a995c
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16828 bytes
SHA-256: a0e2403b95961dfd0303b7672e8e4a2784241443f35f5303648c99ccf986f9f2
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1