Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7b4ba1d1d06573…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 19:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70f10ae71e86d0a82d79f5a782ab56fe SHA-1: 9efcf0bf881952c2cb1f99c4c4a21557c69a5437 SHA-256: 4c7b4ba1d1d065736057d0d77a7b42d38a790453c41d96a983f5dec00ad5e589
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating it is likely a phishing or malware delivery vehicle. Heuristics indicate the PDF contains a link farm pointing to multiple domains, with one URL specifically hosted on a compromised WordPress upload directory. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hondatayho.top/img-ngocbao/files/xogigutefewu.pdf In PDF document text
    • http://ozari-ua.com/files/file/56263055811.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/88343708323.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/lozag.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/dusuxisanodade.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/witusone.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/sixusuvotadipajojoru.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rolumezalujijid.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/wumumopogugom.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fezubenidelodukuselaxe.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/15060763876.pdfIn PDF document text
    • http://9jamail.com/userfiles/file/69340488320.pdfIn PDF document text
    • http://bakoca.hu/files/file/66937117301.pdfIn PDF document text
    • http://www.asslar.de/downloads/rojelesek.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/pivitisawadupipu.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/vatowedagob.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vuputedemike.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4fb9998f210ee0121a9fe12a5d88eccd/vozazonulesefix.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/31787307565.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/jivakedelopujebegefo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e478c3b43---fadowugufuloge.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a244e42ebac---kurisago.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b464b8336b---nobavigusivukaban.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jirenufazujudezotimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=electrical+electronics+symbols+pdfPDF 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_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11016 bytes
SHA-256: 94eb1f6e6c3cf4aa3fc2d6116698dfd51e66649eb9d7755ba5fa9ca2321dbb5f
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16612 bytes
SHA-256: c80ddef4d5d88fc9d3809b083cb449b9a378da63a7853a7c985a918386af5033

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