Malicious PDF — malware analysis report

Static analysis result for SHA-256 258e5d26039947cd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 22:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7cb0afd6c6ce1e39a4e4e485b066e32 SHA-1: d1e2f1b3a1e08998f6f0f65a1226637ae6b020de SHA-256: 258e5d26039947cdb47aeb204ed354c45cc959f27c2a6df00cefa52f7a747ac0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=meridian+apk+android PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd014f38c---75617716658.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/15lki5os4ue7a34cji1cvpjuh2/povuzuxoguzibilir.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/80116444092.pdfIn PDF document text
    • https://parkettworld.com/upload/files/pibokupewumutexurekolovej.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/rijuzizapovuribodu.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/dasexarubudirul.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/49633692139.pdfIn PDF document text
    • http://afro-safari.com/upload/files/mividalizipakeropofol.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/togatur.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/sajapavowimijogejo.pdfIn PDF document text
    • http://parentini.it/userfiles/files/mebuweveni.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/69415786690.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/66681226585.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340da2cf828---pifajodasowobepotepiko.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/83534872107.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/36645781235.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/11654579249.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/1446540245.pdfIn PDF document text
    • https://autoskola-scp.com/files/surixirijupop.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_E7552E8D920EE68A.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fedagozav.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/melexataxo.pdfIn PDF document text
    • http://ristovski.mk/public_html/upload/userfiles/file/rukunozusafafebifo.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/monulorimibane.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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10160 bytes
SHA-256: 4f6e144d0a4b87dc63ad8e7d57919182ef547aa410d69069616d67123a47b66d
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 18708 bytes
SHA-256: eb063da8d97fcf59069bd3d346b501e0704a1d744d95b8e3acde403ba2509d4e
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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