Malicious PDF — malware analysis report

Static analysis result for SHA-256 af97ca68f70b483c…

MALICIOUS

PDF

107.8 KB Created: 2021-07-07 02:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9556be4d9b8a93dbd2589fc40b49877f SHA-1: 201f68b20b1dd39fdbec71ad423491635ac04185 SHA-256: af97ca68f70b483cfaae8d98810695fd32e985d32a5c90f38bf047bc18b18749
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or SEO-based malicious redirection campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/falowopizovixamux.pdf In PDF document text
    • https://promise-land.com/upload/file/denesovapob.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0j01mhco83l7vjrvkli03tm692/jitizaweri.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526210656.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/xezojafedulixeg.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a894bfde66060ff2bbfe55a621f5d10c/36433771622.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fobinorakedenawofudiwo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/derafemalagena.pdfIn PDF document text
    • https://landbar.com/upload/files/95855893377.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/41a2c7c6b65105efa5240b8308bdf285/lomimepabudes.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/61079460627.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a21d33752---taferubuxuvabugavu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xivelevokoxofi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070451317e---4455597757.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lisopevo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7cb61a05---75970795062.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7405b0123c---3043338768.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gepinunadavefovaladip.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/49957006710.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wofago.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730b6e2b214---xifuxosijimosaxomutovo.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/binovezikesa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964da45793b---wezulopugowotiz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c600263cbd4---95126302290.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2205141e9---sugizipekilalele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+difference+between+a+change+in+quantity+demanded+and+a+change+in+demandPDF 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_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 17824 bytes
SHA-256: 8bdec46babc7f68626c91941aadbf83d3c272600fa0fc19029eaee10476d4cfd
font_01_sfnt_off00016ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCD 11336 bytes
SHA-256: 74d83ada7bf4ec04e530d850fe710a9dfda49af410e5e5153c4831b8a5d77a16
font_02_sfnt_off000186da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1