Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b37472794072960…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 16:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e68dda07f24fd28b2417da6fb2e6be08 SHA-1: b3d21d27a4b09b6c1d26cbdbc20df961f95f5c1e SHA-256: 8b37472794072960dd5a173d8435024c7750199734a3d9a1f8b9c88ad29fdba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the heuristic firings related to link farms and compromised CMS uploads point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dineflon.com//files/zofubuxolidolerikonuk.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bbb91ad7d5b60d636bba7bdcfc78bf0b/25471739919.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c5e1f617---50848222528.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/273e0036cb2bfea01ca4a9fde0a749df/62661215932.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcf98261a2---doxosonozusanowelo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/wunexetopubuwagego.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/56988022428.pdfIn PDF document text
    • https://castel.ro/userfiles/file/mowofaki.pdfIn PDF document text
    • https://auto826.com/uploads/files/pijorakinaxogapifezopojab.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/21543607916.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ola2mcps2nd8f8eu0m60pcmn4t/lefopuw.pdfIn PDF document text
    • http://rcot.by/pics/files/94470263209.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/parixo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573f920662---fesukateputufakanewesogim.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/64034592920.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92d44b3a3---21625086621.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/monujamowizefor.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7735fbd3---96445283754.pdfIn PDF document text
    • https://asiajitu.com/contents//files/goxopowigovamofufep.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/88eddtai1rv313tev352t5o1eq/37818926273.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/laxarigupopuju.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210805042325.pdfIn PDF document text
    • http://rurisnet.org/images/file/gupusezuvewogon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=indiana+jones+fate+of+atlantis+special+edition+downloadPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 18524 bytes
SHA-256: 928893d5e32649472c526f6f543d0c79cea0b50ed833b6ee7612e9d7cd5e3161
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 10680 bytes
SHA-256: 42db5b4a0dd0e21824c91dde00a774f233529cdbcbe965b8dce3c35122ea2d71
font_02_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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