Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8786daa8f5436a3…

MALICIOUS

PDF

279.3 KB Created: 2021-08-21 07:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01c1e9f9e6dbcde43c6068ed3e7bfce8 SHA-1: ed1777ec8c2d39f9c7572e58062febc3dd50d0c5 SHA-256: e8786daa8f5436a34b48571cb7b366c6c5659b156fcfb6f96300503ba9bc7041
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9770

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=beowulf+book+pdf+free PDF link annotation
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lakadinu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb1b8a8ed---dorivuz.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/naloxefuzutijigimexiwumu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/5963183074.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bee88074d---wuluvivarugasi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r38bcdjo1iiog9bg8agqrpql11/wazitodegigilo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/io99fts1tvednagqa5r26g4u2h/82093452641.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15c1cabed---fakimosudotokij.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210721084343.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/94749983623.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/eb32e4323e9a171235bd0f4d7b4037e1/rukogonunakixezodegin.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/wijesosijuturuwonedozab.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c907cb750d8---butemewopijufaxar.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/28156605566.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/vepuk.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607906b72c365---tumaroxijilewav.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/jaruxivu.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/takevudaxofa.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/18585167281.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/rafawedavilomazuwavufuz.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c9bc5c48af016f78f6c83b45b589b2da/89517918923.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871b55a5595---58490327459.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/34923171748.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/79da02895ca3fa6245a3ebcb35575011/nifisetuvijetogipizeni.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/budegexakesepobagobegefa.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/88126646012.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_off0003ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EC7E 19156 bytes
SHA-256: 77155704b6a426c4d250c116e186bdc153a958a420188475d1fa52d8e837fb3a
font_01_sfnt_off00041f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4373A 10340 bytes
SHA-256: 4364137de97d698fb64583c30c091653d4bee58a6895a6979e95b1ecc6041750

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