Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddbc31869a7bbe3…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d4023e1d47ce9bdee5569fb221c5d576 SHA-1: f39f6ba1ce28c5cc5247331c8577e0f5d04c32aa SHA-256: 8ddbc31869a7bbe3744f9bffe167e8746dff774b6256d73a05407daf94ce8d1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=45+grams+to+tablespoons PDF link annotation
    • https://b2cexpressdemo.com/userfiles/file/55385391499.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/073f2903062fdde01889421f6afea518/55574986161.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/62091328021.pdfIn PDF document text
    • https://x-software.cz/data/file/48833635228.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/78551603623.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r4cbeaorfj7lnua496r0m7sast/rudagavexu.pdfIn PDF document text
    • https://rjpexport.com/files/wotusenoparubukatodidi.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/javiz.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/88684846015.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/11571547871.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081653d358f3---dijaneli.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3301d9ac1e---65937689829.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/dawekete.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/280042086691.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q909es6sftv5sppvett9ek36eq/67225862002.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefulesuz.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/59956039277.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6d71a077---xulujodovopasuxatedof.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wamubores.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sd6584c1mnc7t6oiajma0b1ljm/jabage.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad4d50911---85746696930.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a7943a5efaeace65f32612d4b7c6d717/toburaleruzawuvepadevag.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/kesav.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838abae4024---sizosemu.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/movifefefebuwo.pdfIn PDF document text
    • 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_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 17628 bytes
SHA-256: aada88a71c8e102da3797f5842c7e833c7eb892c3be98961c435a83d1b66f7d2
font_01_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001445b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445B 10760 bytes
SHA-256: 28a7659bc6a13a05476611abaa93cc0653a7476cf6782d3a4a6abdc8795dd782