Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48ddcdc65e44a3e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0052df4da819ece20edeac910abb881e SHA-1: bcb32bdaa275b41b37063724780d5ec08b2d577f SHA-256: e48ddcdc65e44a3e1f78b5046608a8ec3354bad043a80a4ec9d2511a9f296846
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yourownadviser.com/ckfinder/userfiles/files/torarovis.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/dogidelepapezab.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/napozuxepezajalijafesar.pdfIn PDF document text
    • https://bagstyle.uz/images/file/kitawe.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210914_170213.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/61794205094.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/88458626988.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/20280181139.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210916_941DB4CBE1E501D7.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904173714585342.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109171445418778.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e2mq0rg1s7fp74dmc9cb1opo92/66728610538.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/87779827038.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc63cdd3---85239579338.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/68169445776.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/pazapaxexofadad.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ac436054---15361367447.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/12435330978.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134179a31ac1---lenetaj.pdfIn PDF document text
    • http://voijin.com/userfiles/files/dimajotoritaxeduw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918dab638b---80047349713.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/tepob.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/22667453761.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/90339979664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=it+novel+pdf+downloadPDF 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_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 19128 bytes
SHA-256: 8cc3e9ca67d65c6e3bd95766268f22a9924dd36b650f6b79cf7a8f8827850c92
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10236 bytes
SHA-256: 65d51ebbc76b203df6a5d3dfe6bc3fc37bd415b03eb8e5cec0a516e1e72521df
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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