Malicious PDF — malware analysis report

Static analysis result for SHA-256 733f4a1b60212d80…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 04:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d8a26f1cd4cbd933cfe1c5a58e07e998 SHA-1: 09d20806233a9d4a87dadea3e3fe3a1d5376af66 SHA-256: 733f4a1b60212d806897b8dae18a6afe91d0e5816e5c171d5f5d47d07d37d9a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b2ff08d0b---rizik.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/493cb5efd0415d5f9901ffe7e6ea334e/zigupezileranufefil.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/poloz.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/sagalewepelatujube.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/xorixiwo.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e4a17bae---78856132801.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8944c3c1f---didukivijilubaxelubukali.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/95612795158.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/sozamiwigugexodumilidesas.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/22065a38ee7cb91cd990385cc0261bd9/devonedevax.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/vonobarenuvu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/28935761637.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf622626---33068502306.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5f89ebc50cc179d4d898a0122c4019df/40307339958.pdfIn PDF document text
    • http://candientushinko.com/images/file/13340233463.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cefae370e---67489345937.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/16300848552.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ed62b160d1c5c0eac8834d6e7b25b657/33046204627.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/642q9l25q917ibumc3kqa6cav6/punetakuvu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be1d2420072---beduvadegopuviregofogu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30034716129.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42f9e31a6---jibewibalogapuvonakijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=adidas+ultra+boost+uncaged+size+guidePDF 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_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 17072 bytes
SHA-256: 0f5992165e9f6bd07b60b3d0c184f2fc838fd7dd412dea239041377cce2a5b71
font_02_sfnt_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 10828 bytes
SHA-256: d520b61b98129f668ae5edc19b0b4ece31f1f1ba75ff59590cfa4412b9ce46b6

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