Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dcf10687302adb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bcc4b47ef0ec05dd3f129fc251be7dd SHA-1: 5ec762d221683c0d0b90b2de3f6bcc7a5140278d SHA-256: b3dcf10687302adb00b6d7bcb3e56e93388098f99b6316e018286395c67b6cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to manipulate search engine results or to host phishing content, aligning with a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xpeedon.net/userfiles/file/20210815085234.pdf In PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/34092191254.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/jibusafifad.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/jewazejazadepalememu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7f5316317413a7305a4652e3e99ffefb/41224892988.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zozivafigogagesetatawa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u7f64dco6qbi5vatorcqerm2s6/43924906322.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/kerigujikewabigimono.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xorojoraxekevow.pdfIn PDF document text
    • http://wsm.hk/images/files/kukex.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zozojamexejekavudafabo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/25993064324.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/13148502720.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107190444027583.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f29a9b0db---pexasivojibum.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/rabinofofibewupixasoro.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1670f7ab8b219b2f7bcd6a8b7e6541cf/70496356208.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108869ce582c---40399732287.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/dukebotag.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15c84b4b6---rotusesezu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608175c1bc8e4---22031689993.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/52334bcf356ee9d647aec092410d986e/6274848791.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/21717758199.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b3d87693f6b8a0bdc29c2416eb3cbee6/62872977349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+walking+dead+video+game+free+download+pcPDF 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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 17240 bytes
SHA-256: 8a8e3a418d5f1a3d5416c7c1453dcdb919ac8a6e6942371c3b65975e90bf3404
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 11008 bytes
SHA-256: a01956031ff128ee27249dbb53a6e9d9d7f09e9d2b67b4ab36c1828e1eb66209

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