Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821ef8a5024d944…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 22:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd2a2b6eedd66d5dd39f68e83f8d6b84 SHA-1: 2291d1a9ee8bb310508ddff1592953e2be855889 SHA-256: 8821ef8a5024d9447614441e960caf54ad60fbaf951329920c8358481ecf73ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=the+black+swan+pdf PDF link annotation
    • https://cafemocion.com/userfiles/file/bakigazofedoxabejibujeboz.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/sogidaf.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109110550118965.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/juxasegode.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/67471433135.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f69f3f1a0---28400159467.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tapikipanu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909002216.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f3626e34---tewapasok.pdfIn PDF document text
    • http://clerus.hu/files/file/14488129912.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sabizi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109181858341519.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210914014531.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/weboxubotubewipi.pdfIn PDF document text
    • https://e-room.co/userfiles/file/57376276776.pdfIn PDF document text
    • http://17njl.com/userfiles/files/94349115751.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/mawopemesemuwolenanexed.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kosaxa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161307e607c6d5---jesarivasuli.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/99402553884.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/26060197844.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/pilitojutoguteropaxiw.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/veperuvagasi.pdfIn PDF document text
    • http://cocoal.com/uploads/file/93642125856.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16880 bytes
SHA-256: d7f05b3b7623c9fefa23a387da673177dcef14fb55bc203da463bc65fecc5591
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10588 bytes
SHA-256: 21b8f20a3e9c1581d5682d7a830b6a64060487464518dce80cc9d2ec0f4fbca7
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1