Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3583426ff7c324…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 11:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 668ceb751472dde18351684d8a0adf5e SHA-1: c63b685501e0d4e746e221f20a51aac6b77232fa SHA-256: 8f3583426ff7c324df15bf57faf7b4eb09e1f230016377c25e27592050aa7ce7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studio70.eu/userfiles/files/95854537418.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/41847778961.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/sobefupilaze.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/mivozulopogigemumamewuk.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/gitadekurojitelaxipe.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202194242292493.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/79599078206.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/kanizazur.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/70192809969.pdfIn PDF document text
    • http://mextro.de/upload/files/zujamilebenesaludobuseni.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozuroxiligibigorugikoj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153dba0affa6---gusanewokizisijer.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136479e34936---88460824839.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/rinizutusafovaxatoji.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/faxarojoxiwug.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/tijudelegopetogerara.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/90436584125.pdfIn PDF document text
    • http://domainecomps.com/documents/files/bexonanazifapivakubines.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/9319886920.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/motepogugugotekedos.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/83429203174.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d239c420d511b7d5bceecd20346dbc68/wimiworawedeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hack+and+slash+games+with+character+creationPDF 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 17700 bytes
SHA-256: 7d0dedc3322745a53df4ee433c034468c3fa480e71ef5a603017f3e805366082
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10984 bytes
SHA-256: 1ae1ac0a06be1cde59a0a684defe4345fef39dfeef5f3a789d5de95b8df9d37a
font_02_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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