Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d24bdaa55e401e6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 19:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbd49e765104f06957e3753cf80a66e3 SHA-1: 11ac4fd874a5c428fe6b1acb90b3d8ab51267b3c SHA-256: 4d24bdaa55e401e6c5018a5f83021fd46218adf0ef1a85abfee5d0f307b79951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=how+to+add+shortcut+to+home+screen+android PDF link annotation
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/rekamimewadipura.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sugagujofijanajovi.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/63573430239.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/vovebejanupokomofe.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/xakotugagevewevux.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140856364953---wixawoxizevatifon.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144422180254---kinipafokuduzozibobegamav.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/viwatiwijuwibudi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/38587250589.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2df264b---152752933.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/verowumijipibiji.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/76697252216.pdfIn PDF document text
    • https://ptogel2.com/contents/files/mituxevexujuju.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/xowejupubolef.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/71cee0b6a445560eb0879203e05a2f40/73774729603.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/kijeboronuvapasup.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/84190461807.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21977074604.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210919_25642C48803D3FA0.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tugepusip.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9f84b5d51ae34f6ed220a623862968f7/28360017418.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/powunilufavekiwenas.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/967c1e1e41748d70beac131c034a1f70/89358731396.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_off0000ba37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 15416 bytes
SHA-256: 8b51c36b116a3ddd77205bd18b48d6253c6e1d4033e16f006420d85fdeb9f7e6
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 10764 bytes
SHA-256: da3d0db6dd50eaec8bbb304347b8e53accb68a7ed9e35a4f63a35609ef717788
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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