Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f823a08a9e7aebd…

MALICIOUS

PDF

76.8 KB Created: 2021-07-21 13:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0688b11297f44fd9b37cc8bb7a235582 SHA-1: bbf94b932ea2e377c3670d2b2af1a88ebf176b77 SHA-256: 5f823a08a9e7aebda261e2e9a37928939e3e556c1286e0815792ceb7806690f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or spamming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The presence of a link farm is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/gujonoxa.pdf In PDF document text
    • https://alrukn.co/userfiles/files/98765592291.pdfIn PDF document text
    • https://soechi.com/userfiles/file/43159003947.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/58412958.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/27bd37779a6b83b688a39e58f15c818a/92223079476.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6d7c0c793db210423a74fb11b5bef6b2/38559293054.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/jafefigovetekugewul.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tavawogunapusovigepe.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf09h4ksm43a823sc707hrigsg/lujirupexuzurubidujimapa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9604e3d34---34704740995.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kivamatizumegejuwul.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8064184709ca2ed38154996bab9a20bc/10896227650.pdfIn PDF document text
    • http://cycling-software.com/files/file/wesuvuxijubijija.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890e8042580---25823188008.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/pesajomawukidatalabuxuxa.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/14961599582.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39154873666.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50fb89a4c6---25563520747.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xumovegukejira.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc740f4c5a5---97437240955.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/36006743354.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095563dcde12---xinemenesofedof.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/51399710253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=worksheets+for+toddlers+age+2+freePDF 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

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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16884 bytes
SHA-256: 6609c8d4c3f7d0a79259527c75acc6e5bc5d8364faabfe88c858aa3abe873075
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 10644 bytes
SHA-256: 22affaf3527112edd926a792b0703fe7f14003d9ad953f286611a385dcff78e5

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