Malicious PDF — malware analysis report

Static analysis result for SHA-256 92845e8b58c55f1f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 10:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25f9ba2e5916fca941186811b0769246 SHA-1: 77a867732ba8cd1f5c70570badf87f8a162da8d5 SHA-256: 92845e8b58c55f1f6f958c82447b27b45a13b86cd9e0fc19acc59a3e90144ffe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://viboot.com/ckfinder/userfiles/files/ruzalupulukapuwikunirosu.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/66848054400.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/tegimopelof.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9ae2bc4a---mabavejorudinalufugajoti.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47235091067.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/54488241282.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wunemegajomap.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/78153486657.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/28850601662.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/samabinejebuvaneru.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/54961571411.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/86597493224.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648293a618---99945465834.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/90978584413.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/3531617748.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb651245bb---xapibiwuvademagosozux.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/jufagakato.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/mijumemoses.pdfIn PDF document text
    • http://midel.me/userfiles/file/84994924670.pdfIn PDF document text
    • http://sdds.be/userfiles/file/sutikidodezizapejokufe.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/99872408503.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/4391936099.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/44917412764.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/tuvibebeni.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/90630076843.pdfIn PDF document text
    • http://chromoink.com/updates/file/89272408153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hematolog%C3%ADa+fundamentos+y+aplicaciones+cl%C3%ADnicas+4ta+edicion+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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 18716 bytes
SHA-256: 17ebdbebafb40b5adab5b3cdaf61ae6d5106d99fcdca2c57ebf13350d9b299f3
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 11208 bytes
SHA-256: abdc269223f4043fc00c0b7cd385b4126aa167a7ebeb2accfa82672de90be45e
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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