Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e647a97f63f4d66…

MALICIOUS

PDF

81.0 KB Created: 2021-08-18 13:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ab8984b1c5b33ca22ef5a4aa738f48b SHA-1: 40cd8c32c2500bd8887370ac730634335a48dfd5 SHA-256: 0e647a97f63f4d66142cec5bcea09ff077ff6bda09b36f944851340e88c6c5d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of many distinct hosts and disposable hosting suggests an effort to evade detection and maintain a broad attack surface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9194c329983ff761b79475e9d8be121a/badir.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/42a97fd086521172e03c944d79c0d35d/kepapize.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/votukozowatad.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nvti64e1d5h8h1p3ne4lnec9k1/32667007054.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8621ef1253---newuluvunibupewixi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kuvudu.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/66987224808.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/65229019795.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/poxevi.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/90237920227.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/56108232377.pdfIn PDF document text
    • http://carszana.com/image/upload/File/jazerujavajuda.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0410f51d39e58a85b8ce0ea1116d6a1d/xesoviderupafin.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/fazonegazov.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xebofil.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210808134156_1145943697.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210730043533.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/97889906998.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/65048271765.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rotavebudoranekudoziwujig.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/78940428189.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/88099937534.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/59580581287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=commonlit+young+goodman+brown+answersPDF 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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 11060 bytes
SHA-256: d3a8dbae1cb1982c2bb6c5dfce46a0c2e4766a725c23ac2b6bc59a440ec59c6b
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16548 bytes
SHA-256: 53032c3537b52622364bc7ebed407d0c4a31a88671edb45405a571e0f986e66d
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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