Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f39e644ec4b9e4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 23:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac9923146f30354aac4c179e8fb42a99 SHA-1: 50de3aaf775eeaca24fd1162b5eb24798488c9c0 SHA-256: 84f39e644ec4b9e487af71df0dd0e8f85b05501b25fc2fae9bc19a5cb5346566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The heuristics indicate the PDF functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the 'Pdf.Phishing.Trojan' detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://karpataljaturizmus.hu/upload/61651425535.pdf In PDF document text
    • http://robalton.es/Albums/images/file///pikuzewutokozejazadoru.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mimeferewaresuzema.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/panufunewaniged.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/redesokalufovefibuwoxevaf.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/tonazeverojud.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e283faf953---75626469109.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/4199641878.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-16/images/files/vunuse.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a0211815---zigitenasito.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612765eb078cc---zixagevewakodotijasisafu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/937d8c8c01986592c1ecc233e135c127/21507208756.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/gewutodufototuvaruwudukix.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/wanaf.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/morevipumupamulofosepowag.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3b1d97c08be2794985b534de1ad7cd59/jinad.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/xuguguje.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/nilol.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bln2e37n31lmufhjhlmgso22qb/15025335439.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/pefaxomipa.pdfIn PDF document text
    • https://hgb.se/filer/file/dosedatakizo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/sadudokizakofavaxagosef.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9a6bcef3628dd5d409a8bca23d5cbbc0/93173082360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sound+energy+definition+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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 17544 bytes
SHA-256: 7b031b8129c5588a6084b775b734d7f71b22a3b6268fba2e4c8442c4b00e6a28
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 10584 bytes
SHA-256: 442c91093e741b31d117f4417ee94f87fd609f9076a5fd7240fe6f95637489e5

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