Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86e3090ca356ab1…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 08:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0ee4829f432978975f4f926a0a58702c SHA-1: db03183905c8544127892972d5ba4a657e320126 SHA-256: f86e3090ca356ab13301e8cd45ae2100aec4ee92ac35b9e50963b519d868f780
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external URIs and compromised CMS upload links points to a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://malabarmail.com/ckfinder/userfiles/files/47598652449.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e6ih46furb021hsb53d4pkfpp7/37122611590.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7198dd5841---65571006847.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/mexuxinuvofod.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0bd64ff---mokewikanupapisivekodegow.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/032v9k9fnsb398nl381d73nj50/rinadigojubipegozubamilu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5d4d2cc0e5cf1678d6bfb704ef507332/duzurupa.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/jisexerabafatupel.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6kgbqpp0i14tp4oqgcqtphgds2/74006512779.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e38aa9210f58aed36b57d6eb885f70d6/50812809351.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a940064224---wumunotem.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e630a4fc52ed355ccb8d627367ab1175/42337516937.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8982c95df0672b54937334db26e8a1ca/melejobawalexixotudebo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdccadbe3---22656676451.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gajowajenip.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070490c33671---88360084421.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a777704e771f5c61530aa0be4f7f54e/motinekudol.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/kepesetakisapozugexojite.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/83413402878.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/75577455009.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605ac42dd9---fituzapomepeneje.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9823901e6---11886089548.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fokofano.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/snj3qeuckl1n8vijrtbvhn5dqa/29279406484.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/jifarumewivedojixufemuka.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zevidijegipetavupibo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/75477005593.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/foxemuzijitewera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inter+1st+year+commerce+study+material+pdfPDF 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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 17076 bytes
SHA-256: a87ab5bb66accaaa5689704b3be9037a71169d800b006518fc874d51e8180bf7
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 11000 bytes
SHA-256: 829550c4e7b3ca310dd9cec69494ce989625d817069b7fb697b0abe12b5e12f3
font_02_sfnt_off000132c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1