Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeff10c9b6504213…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 22:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cc41ceeb71b9991706224dde334d04d SHA-1: 31752acc8c02cd5257ae08f85a988fd6b00bfbd8 SHA-256: eeff10c9b65042138543414cbc2a9e4ce3b63365f00d9d40f1345c585778522d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or lead users to phishing pages. While no scripts were directly extracted, the nature of the link farm and the detection indicate a malicious intent to lure users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://polandpools.com/contents//files/45389702932.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/61efdn70cufvmphshn89ljapls/miwefa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/as40uq80b04q87m6qd5p6g4tki/92393271914.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160799b18dea43---55376595949.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/xodopawoxawuxilimi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/g367k9viifn7t0ah8kspqdhr83/99153454867.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b567d0d5---dinikaf.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f733547d31e21165bb9cb94e9b1b64bf/wopowekadilabutu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/25442271963.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/57697492473.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad00635f7---zonemabitokimizanovuvube.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/kijojizorexovenujevezema.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b698e5dc6b---53149726468.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/kuzumewolinet.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf2073129---43386882231.pdfIn PDF document text
    • http://korytnica.net/data/files/93063152916.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/66966608316.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/1074110259.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09481697b5---davolatavibavamo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350ef620af---bitowipe.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/1022678830.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7idnvbtopmvpmnrv20aflbd4nf/63216182353.pdfIn PDF document text
    • http://deauville.ru/files/file/nusazolizanujuxalagotovo.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kipaguwolutikavizimedepa.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/17672480625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=principles+and+practices+of+management+notesPDF 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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 18176 bytes
SHA-256: e7654379500d7ccf4be0e789c40a7a9183f9201d331d09c2a362a1e6892cac19
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 10964 bytes
SHA-256: 95ee9331664344216b1b9fabcdcbac324c41a6402a9506f70bba7f6ba46b67c9

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