Malicious PDF — malware analysis report

Static analysis result for SHA-256 df937722eb2bf7fc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 22:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b574e1ce4c398e8b82a2682f48aa02e SHA-1: 36a5a3a4ec0e991bba1e80cb359c93ec4746e728 SHA-256: df937722eb2bf7fc1b854628dadb80eb8cd177e93569f721aec85e514713bc55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, aligning with phishing or malware distribution tactics.

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://visit-pune.com/userfiles/file/rujosetodevozineworu.pdf In PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekopisaresufasafe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c407db93d2---simajoloropexeser.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/16239854840.pdfIn PDF document text
    • https://euchebnici.com/img/file/17690196155.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/winifulixovexotuj.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911852137592.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vuvixigam.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/29856169517.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0874b66c22f3bdd65c4e66eecf91a810/83898071477.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/leterunusetetujisodi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147ebf51d099---32609275783.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/41986692465.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d1105336584224339882badc9528da2/95885612195.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/vetovaxexitova.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xolatasevofiziv.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11d911966---bewarogizamomuzakavarum.pdfIn PDF document text
    • http://idroter.org/userfiles/files/73182853213.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/83406422589.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/68728787809.pdfIn PDF document text
    • http://teraval.cz/res/file/1953819535.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/nubuxowavizepupawuzukukim.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/58399994187.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/58154122603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cara+membuat+splash+screen+di+android+studioPDF link annotation
    • http://irodori.kir.jp/files/file/73952492878.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_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 11048 bytes
SHA-256: 9015b1bb17e3c101568df18c340075016427320b1ce29b60304502006f4d21e9
font_01_sfnt_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 14436 bytes
SHA-256: a265780f4b9025478b83379cff957aaccc3aded9aeb2a9c3546f27da205d6929
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1