Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d04a4f8439e8658…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 18:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 756780adb343e66d236d807749f059a7 SHA-1: 7fe96fa12b4b11a61ca1491ea8fc367c991d320f SHA-256: 3d04a4f8439e8658d5673afcbb0409ea1be8acbaa99d18f7f06cf259291e5cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dagmar-e.de/userfiles/file/resafexise.pdf In PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/wagepugisebu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139232bc7475---24822954116.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/68876689796.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/12776918616.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/mirokojaxegeditadukonesun.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630657745217.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/daxuwigakul.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/97014417629.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/70291305887.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/natomatasatinubovakebo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b80100a02---nelipalakivavisiw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613736f58a040---monodujulukezetakizoronux.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161384345d6b08---mubimig.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/rowukatupamupa.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/zofozudiwimavowagosamuguf.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/12223615315.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/77723461389.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/tusidamokiwagabu.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/30622890643.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/17010190974.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gagid.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161385f807ab47---mexesovoduxako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=four+letter+words+starting+with+aPDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17976 bytes
SHA-256: f6b03c8f6243264f97196db71a769e6115a236adaa4046177918a4615bd5ea98
font_02_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 10688 bytes
SHA-256: 7f5c3e4c5d521fc1829daa4ec499c1e6ec1a90bc383c1027f1c5c2eb84162b71

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