Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3364420dfb950f8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 23:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76284de48c5a9e33f49339d52e758588 SHA-1: 438146dcd4948cdea7ff44f761956997d1f3cea2 SHA-256: b3364420dfb950f8b2ccb3ddf7c0112627b9aeaa4b6aaf44709b1452c78c854d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=free+v+bucks+in+battle+pass PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154a1675b3---46139612721.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/43436818102.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/19357259818.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/145bd225cce601cdea1c4807444d2860/tirikadubojesolujodosetu.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/58009008128.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/80651094941.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/77215718419.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wozodaloj.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/20809405291.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/62017599172.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/27164403898.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/36126460328.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/42857897990.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361bb7e8f61---3673432012.pdfIn PDF document text
    • https://expomediainc.com/upload/file/sabekodavurimawerine.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fizilusufoxawogi.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/ruwuvufizezajaxew.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/75222255419.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/16590832542.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33879482359.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bujuvawawinemetexetesolow.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130385e3d35f---virekuxi.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/32148439548.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/mawitekunedadiputaje.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 17468 bytes
SHA-256: ee9aa3bdc783c62171185628040c5563392c3c58ed4f26e1031c9e5a75330a40
font_02_sfnt_off00012c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 10620 bytes
SHA-256: daee501e5f0bb650bd388b7b8f364e1c6c8ae180b8d02eace51eaade14f693fe

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