Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6fbd43d7f168b2…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 16:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3c4b43017852191396e31b2623771206 SHA-1: e73e1d83b7991fe45747db9d0e82b20f0bc4c823 SHA-256: 1d6fbd43d7f168b24253c14eda323b5c196a5cf81b02e3f4ca4a6799e1404d34
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous links on potentially compromised or disposable domains suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://shs1977reunion.com/clients/41590/File/fukivujek.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7e27284be7aeff7a873be7c7ea075b6d/xatos.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9ad4f791---jovekasa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160781b7821299---jafimewazegudukewexog.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/pisezomo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zemirujilo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e3182d058cd42f909c1a1c33b0a33656/fedipowafimibozoxe.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/32b81e9fb54629a01976eb6aa1475562/xawumizenalenabubesodipen.pdfIn PDF document text
    • http://coffee33.ru/archive/file/42083336122.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bfa7f1cf0a6fbf64fd8aaddcb2e5fa33/lewipave.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/30310188243.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kuwugi.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/4914135925.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/zadapewaxonivotakemod.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/bekijet.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c633ebe02aa362367cc61f5fb01e1fdc/sadoxolugafuli.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/lajozamupotalowowaj.pdfIn PDF document text
    • http://groupkaishan.com/d/files/21497191268.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8adcc7a6---47079981363.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d19752068---jiselijuvowitamabamur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=debt+collector+stimulus+checkPDF link annotation
    • https://lapdonline.org/file/82687761267.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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 10564 bytes
SHA-256: d8566c685900e97f47c01f1ddeab8465d5f21f42373332b3caedca47b09d3b71
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 17568 bytes
SHA-256: 04145605fe589e0b0d7f1f7f994334c9285d59f8957e74c8c0f719ff2ff7e5e9

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