Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8808477f0dadce6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 21:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fba70e3c6b286688153e7ee6c80b6d9 SHA-1: c147be17e6e90ffef59d1427b710262cdb3ae40c SHA-256: b8808477f0dadce662237565e579a8cabb2087d3f198a84e641f8922f335db6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=ingilizce+deneme+s%C4%B1nav%C4%B1+pdf+lgs PDF link annotation
    • http://viswinkelindex.nl/images/uploads/36115498522.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/70351851741.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/bividupipodugubokabuw.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/24778868643.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/firupatamulisesafidup.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/nuh15dfp065bvrgoeo0sjaf91b/vajajegibiwujik.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/01048111c25b96f5ff6b0c84b7b441e6/45759096423.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/58677954265.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/85984149179.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/52709128913.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/25529901000.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/95834067588.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/n52ropi5qtudle2hup3v9ct0nk/67903932831.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/linoxasirud.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/fb772901da2abb2e25f3254bec178e8d/20748129277.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd63ab5c5---53640376172.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f691c8c94ea443a42f9377ef0b93ccf/lekom.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/lasixelasegifusagasefupot.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/jiwom.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/50461970505.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69480445665.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 18280 bytes
SHA-256: b28d889ce02dab9c71ea987b8c8eacddfc59c2f23b7d902d5d02a2de527e4305
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10768 bytes
SHA-256: d9ead79b24980d77b70494bc8f6006859d6d944e11fee9dd753b21bbd335e31f
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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