Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb46847fec24f7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 12:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d38cb8265dcbed6b65fedd4cafc2b46d SHA-1: e3ba091653d1e030a7f239caf7776151819cb0eb SHA-256: 71fb46847fec24f7711569012463fc9cbfa0bb21385d26e9a27c9f95ba72a092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vector-luczak.pl/new/fck_user_files/file/69758853235.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/260d8a2dcc6ef02db1f6659a4ee3859d/24396807513.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/nawolabive.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/tomagewepinafexuwovumamax.pdf
    • http://rileyillustration.com/images/agency/files/62084897673.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/86693843526.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zoxijinilopetifizakogo.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139224a5a770---bivekavozozetumawu.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/zubobagixigopa.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/igrl84uatr7sgch4ghpjn35am0/vuralojaridelet.pdf
    • https://mudraconsultancy.com/uploads/files/19198941731.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pigodupovineworosuv.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cfd82655b---28090865206.pdf
    • http://invismortgagebroker.com/images/file/72728582538.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/69113613759.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd96bb951---9992123591.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ba3813914010f4bfd8c9f856d5082e79/poludozar.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/lufuvasu.pdf
    • http://fnathservices.com/upload/file/10446857038.pdf
    • http://reklamavysocina.cz/UserFiles/File/luxukige.pdf
    • http://www.nomorcantikjoss.com/file/58648744.pdf
    • http://cukrarska-vyroba.cz/UserFiles/File/nakaxebegopipesabisa.pdf
    • http://studioindelicato.com/userfiles/files/31286905875.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/82060920825.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e57cb9cdc06bee9b7a22520f720f759f/beloxaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 16792 bytes
font_01_sfnt_off0000fe0f.bin
f79586559bda4df0be4b6810bb2d3a4a322cd3e297b807f5f92ccfa4d220de0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10340 bytes
font_02_sfnt_off00011569.bin
1ce043ab64c777e5c24c6b945317882ded569d7fe1f26b7fc71ee4174f2e5efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 17320 bytes