Malicious PDF — malware analysis report

Static analysis result for SHA-256 9420def10e83cb91…

MALICIOUS

PDF

85.8 KB Created: 2021-07-19 03:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7af9954ce0059c05e5b22812d94fb5d6 SHA-1: 8a766422ea5d4535df41246b4b72cdd7d84ef495 SHA-256: 9420def10e83cb91eac022fa6402d0651525bf63640fc80dc592bb18532f57d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9359c77f9c0d31c41e68f2d9f68118b0/kodotemaridubegakatawema.pdf In PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vijokaxegejutosajofawi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/vugekemewiva.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/koremavakodudufijorobu.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/22209693108.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/87885291054.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/80029780623.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3lbb0v12lfoetpotc101dpkv2u/tuvixo.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/80668045341.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda786be9c7---lufisepadofugezok.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160958846810b0---lonenizipumodixome.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/43142658995.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b245e869115e5dc48b8362209003e715/84077661280.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a0b56svkus8athh8blhkmg6m39/raxojunewapirasomivoxa.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jisoeee7r6i06jsvbb3e6tdf2t/warimefiguxuzovuji.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894c9b1e02d---88690074008.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/feb7f279accbb3ce55c009ac02e13fc2/jufexevevowoja.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/welagazigenavimekotutitob.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/25278241959.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/065db3c9870c39900285826b23d9aac3/tiranuwosesatinowulexin.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3m99q2fn13v9r53frdjp3tl2a3/jafonijiboke.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7be794f52---kudomufurejesoziv.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/72538665071.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a126033c3ef---83314514986.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/waxizapubafarunopewozod.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6tdjb4gublabokthvf9i0s82t7/68890082843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cervical+screening+test+resultsPDF 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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16864 bytes
SHA-256: 2a1113e2d859440af71bdea24a83e3396dfb63414f7ef2653bcf0ec8a1f0ee1b
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10480 bytes
SHA-256: 8c83aec3c5bc8f69ade87ecd127155585ce457b11d4d64ba13db1feebabac38a