Malicious PDF — malware analysis report

Static analysis result for SHA-256 16577cb0e8274fcb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 05:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c67f3873bf75f6e987284f7554924282 SHA-1: fd1d7a7b1dbe9be81ea87f406d01db9399df616a SHA-256: 16577cb0e8274fcba989b81df8c693bac91b128b84333203b3eea383147cf2e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crewmak.ru/uplcv?utm_term=how+to+get+deleted+documents+back+on+android PDF link annotation
    • https://plewmal-d.com/Uploads/files/30783495561.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/56605498122.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/lafex.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/xezepesetidat.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fexobuguz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139591a225a4---fomemosulopevamepevusim.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/17177375384.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/zezoxeb.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/xebolemezuwofuzenuterofem.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/68488138627.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/99311975037.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064c6b12d1---gotumuzamowotoxapes.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/92554558387.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rofajejuleliwin.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5728cc5ca---97452667218.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/67524467463.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/genogofowasa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/11999036633.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kobenijirukuze.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/50792363141.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/rojixu.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/21546212746.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/96188685212.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4419332763.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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 18024 bytes
SHA-256: d87ee48ed525b5b4625c0e2949b7a81789f66b6bec6426550dafd8cf903ef85b
font_02_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 11124 bytes
SHA-256: 2a04bb609b1bf859303755414a51d470084ff91ab6824cdbce5d91e980b9d718

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