Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fef99c0c3173cbf…

MALICIOUS

PDF

96.2 KB Created: 2021-07-01 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7277a055ceac15b2b2eb17e2286660d6 SHA-1: 68a347b20c9b167774ef6cb05c754352d605e052 SHA-256: 3fef99c0c3173cbfc29baa5bc7e43d029f595039e2b7c5050387cd530e274b88
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, which are likely used to host further malicious content or redirect users to phishing pages. The presence of a link farm on disposable hosting further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c4d2e46455f3911f93399232a8eac9f4/23468083439.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bf9358ff9de9eda11694b2c6a84197cb/69482918293.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e87e8c042---48448156816.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gemixutinezevatokoreviv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/88304892c136c2424443bd27f2d2b695/xuxaxopelunomixepugi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fie65m8hudv00qhqf0j7b4viug/moxinazinazutotekef.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c9e386e2---91002387586.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3eb374444599769b3aadf6ee37f1dcc1/gofivixixatus.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/4760426791.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ced36e2d09484ec50f1a048204d7813f/69711619967.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/dewutuwiw.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/javeruporugasagekak.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9786cfcdbc911afebaf2afd65ef4e16d/nodesisivudadatusaguj.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/zaxuri.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0979db855---89443135116.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202153092235556.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lixamulimuripunejesega.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/df07394f8bfe2695ca0f7ab6c2a79dd7/giwuxeluvavejetuvanozifo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/40339724179.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/97806432656.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/96ed195d30ac181e59707d291bf2747e/vilanexulisopewawozogufug.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/32162503641.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/59254607417.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4c09905b0l1gsrs34p786vfuii/fomosidafoler.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857344eb07f---67585978126.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+does+915+mean+on+jewelryPDF 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_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 11100 bytes
SHA-256: eb4a02c041282307b422a931f965b35a1aec2ca8c4646447b41233b2daeaa29d
font_01_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 18664 bytes
SHA-256: d1dd45b285faf8c4bc8538e32b61c81ffdfbdc6c2f5a6b2c5c8b2f4accbae9a0

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