Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e94073939f420d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 06:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed539d7281ff078c65bccac945203375 SHA-1: d1128818da069c6cdd8f79202742d552271f17c6 SHA-256: 86e94073939f420d81114851571a1b5b7ef8e37ef4a0f234625f65ce98727f5b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or SEO-based malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://agro-vostok.ru/userfiles/file/20528837007.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f9b052q4dstfq7dsrdrldnrbc6/fufoponokujikegonisoz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9598418eb7875872974f5a7f596fe88f/jojofupanaz.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/59598d60edc511f47789564b540ce743/janemobexenepezufesuz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f5a82acb109b0cb103320cb2805de73d/69421335890.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uncfqjoodn8oe2ot3jeid22r88/luvuwanakubezikidiripip.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/78591666753.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/33496619027.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/94822593358.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073640c5c828---66580981674.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/wovajowado.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ifb2fjqg0g00mjd1fd1r61l15g/592276818.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430160041356629.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/37361576273.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd8e15f60a---79079395747.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe5261ac4---11291608819.pdfIn PDF document text
    • http://centronegozi.com/public/53201547670.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd906f831---bafoxivamawotubatoxeva.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/91858957692.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/37470535967.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/zuvot.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/67638970553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ugc+net+paper+1+and+paper+2+syllabusPDF 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 18356 bytes
SHA-256: a71682298cc9d922fc90ecc91847b60701c1f8c27e7cdad16fc88b6b8d0dbfbe
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 11008 bytes
SHA-256: 7f69ab11feae0803007c7d960b520a0b37f92923af06bed8aac7d2ef00e09239

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