Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cdcec553e099b7…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 20:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a3c60e49ea96fd955ee0e0999365c50 SHA-1: 3e2a0692251c079db4fce25b740c02925729f011 SHA-256: 53cdcec553e099b708b3395815acaaeaa175408dab702a628defd459464e74e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://leasingtowers.com/ckfinder/userfiles/files/gimovipufurikokovelos.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9j7tc17gl245pf0k2unj3e7q1j/jobobes.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/futirejaz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4705dc260d---wuzapovopibelude.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vl3b0pe5h4ufs5kn3cocpn9uli/1515034459.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c39c8282---vunemilojizixidezubowagen.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zakawagusepakupuzepaweti.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889f401c599---42201736665.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/nosopetexepusevapotuka.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/7rp598avm6gda9pmeamgv52mvr/77930905735.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7c1b5533be441e345a46cab9f59789bb/nowet.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f1492f8---zibixamadibo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080232249113---59571316945.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tapodixezevafixukuwutara.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/61450772288.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/34c40c18bd9250bc20b78beae73e3e24/56964542063.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fa502afd8e4b2fc06594751126920fc5/73083958611.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812801148aa---26577932089.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/76257642339.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/19b4vc7in89n271if7nj3vjmm1/55123506410.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87634369682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dead+by+daylight+custom+iconsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d0a5fca4---gisumepunikazixanumenagaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17708 bytes
SHA-256: ae8696b1286bb6979bf0d67d934515db5098829dfaaabd35c79c02e75031522c
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 11072 bytes
SHA-256: b8fdcd5ca73d4a79cad9eed2402b505a234b6b1a3d3228e4bd33b4758e786cd4

Open this report in the interactive analyzer, or submit your own file for analysis.