Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c0c6255c5cc2d9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 06:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26a5a99215b759220d9ed34d19673d12 SHA-1: 866c2b2c65ed1cb59918faf537c826fcc5e984fc SHA-256: a1c0c6255c5cc2d9f27d0ddd1621032b03db6299ba6c930e3d976b187beeb66c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwrva.com/uploads/files/gutexixetum.pdf In PDF document text
    • http://marcth.pl/media/fck/file/durakajinexomijulajumu.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fijobibugenololuzonokulez.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010855435099.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132e813b7ba7---bujimogutewevere.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/monopefuzukuxoto.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/76987012221.pdfIn PDF document text
    • http://machulski.com/public/file/19419826815.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/zobuxivapativoj.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/25242342245.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/pufuzilupuxomivetugi.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632149847BK9d.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xojipake.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/48796319289.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/83161997757.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376d0512bc9---12265840028.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/74388197391.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9ac1d031---jedezozaput.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00cd46334---dunofowubonerewavemamis.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/82920155590.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/tuvobemagus.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/1364591016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=killer+in+the+guest+house+full+moviePDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 16412 bytes
SHA-256: 91ae8bd081803ba480b0e2b9bafd2ae1c468e0ea86825b1b85fe04105751d00a
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10656 bytes
SHA-256: feb776176cce2a48ca70e4976235cdc88997ba2dedb744576ca59d15215a4f2d

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