Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d040b7506bb9ac…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 06:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 630a988e1cc3baf96bac0f29145ac0bf SHA-1: cf999529f7d99cedbd0cc8a0f4fdce6bb04b2c5d SHA-256: 72d040b7506bb9acd439fc9b5fbd038c0f8ceae96429e9b5b1dbfcbe7409522f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains indicators of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The presence of these links, combined with the 'Fake invoice / payment lure' heuristic, suggests the document is designed to trick users into downloading further malicious content, likely by impersonating a legitimate financial document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=galaxy+c9+pro+screen+size PDF link annotation
    • http://rucodelniza.ru/userfiles/file/93053664773.pdfIn PDF document text
    • http://trieuduong.com/images/Download/tunekitabiliwek.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/89907856803.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josobobisifozogelagele.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/gejejiwatowi.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/18699333826.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/71849597581.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/mafugafedarowazivobafixaw.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/jedalapun.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132388ff14a6.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zoloxiriweteroxuvigexazet.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/makaxuzurij.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2a23b443---pakumijavojusopek.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/lilaxunugit.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/lodowubafasavotezitero.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/57090120502.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136eacde79f8---rigofukazenowozolixiv.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/6943950570.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/rijib.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/67717686642.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/63969465024.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c4prqituflm2sllj5fftkuktf6/legafudowiv.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/sofor.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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 18428 bytes
SHA-256: 1389aeee4e5b3e82a66c88f78d76601ddc2aac2b3d9049f2929d435e7e4d5844
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10752 bytes
SHA-256: 06e3f5f760df87dc6a9caf3cc2d20c64950ef3e25f4b6a9f92eefba3acba3057

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