Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cf2414d24c1ee0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 01:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c292176e80f9717b925b0effd6036f8 SHA-1: 662c4be83a904f53f5169228b0b9308a1c304d8b SHA-256: c1cf2414d24c1ee00f8d1d867c54abd8d89029b82357f679e843e00604677967
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to potentially compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or directing users to malicious content. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://falerisztika.hu/tmp/lipusovixarefo.pdf In PDF document text
    • http://forter.vn/hinhanh/file/zabivuxazefif.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/burupozug.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/625459828.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/92ed019519596f8b4c571a194fac546a/43407820175.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/62876630303.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210821_A8B4D12496DC5AEF.pdfIn PDF document text
    • http://candientuvibra.com/images/file/46444421649.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecc2deff01---mirebababodaxubagipilad.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca1b14851---1791390818.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/voobnvoecjq8s22l4dumht1o6v/devok.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf598d3c20---91364895447.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16093502fae748---87496078404.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/modib.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/mapedavobi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/negijamujefitorutit.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/38742069869.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/sisiwunuwopufilep.pdfIn PDF document text
    • http://scpt.it/userfiles/files/15984146154.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/18801007257.pdfIn PDF document text
    • http://greenbrier101.com/userimages/14642409547.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/negovenabimafoz.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/20152301583.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/83065236758.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jidawekotavatavananiva.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210811085011515626xb51zcndnt3x.pdfIn PDF document text
    • http://dsraxys.com/uploads/rogekidevugizagole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=serial+age+of+empires+2+definitive+editionPDF 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 16936 bytes
SHA-256: f5ca27868db49722dc4f5d079fe1e71dfda26dd2fe5e644b8a92a1fbae127b67
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 11100 bytes
SHA-256: 6629ada4ec20a07b2b42f87f3c00f51f5bb085d5afe680db6070473a4a8389a7

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