Malicious PDF — malware analysis report

Static analysis result for SHA-256 86811d3d0b675522…

MALICIOUS

PDF

119.9 KB Created: 2021-06-25 13:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 85faaff7c6b90e55402f5dccecfa69d9 SHA-1: 3a3022f12679d80dcccf935517858fd57c452152 SHA-256: 86811d3d0b67552289eb3f71c4b5716135fe5c062b3b0914ba9e0f523a9dea8c
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs indicate an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://staractivecollection.com/resimler/site/files/towodazabuliz.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a0b2b48---zozodiridozipaxerowetudaw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c46368c39bcbd8eeeedb81b705740750/48798225887.pdfIn PDF document text
    • http://mid-europe-ex.com/11336813828.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/palozosapetogosevokobisaj.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4aee2e05---xokulabiletuxalaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c09342682---gizolegawepewet.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/42384537196.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/45405255727.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bobedode.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6eb75bb70---75448796651.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/damufibesupotezet.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2ae815f8864337500d27b3a1ab8887ce/47705249052.pdfIn PDF document text
    • http://bjjiffy.com/upload/moxiwoturiwolas.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-18/20210618003658371929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nested+do+loopPDF 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_off00017411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C27 9904 bytes
SHA-256: 1909729bc3356c2183b14eee3c1375e0ec434c43f303198fb0510275ec5d84fe
font_02_sfnt_off0001a224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A224 18272 bytes
SHA-256: ee6232495e7f02326447ecce9d57ba082c5595ff9daedbca83112190bce1288e

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