Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8fd8d2aae53b86…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 10:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d721867b488151b218dd2421c793805 SHA-1: b6ffe88975708d7f21323b5616812b49faa5a376 SHA-256: 1d8fd8d2aae53b86b4c119ef222ed5fa1cc74742af1fbfe48c32e844959f68ff
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 indicating a high probability of maliciousness. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ip-golubev.ru/ckfinder/userfiles/files/83375245694.pdf In PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vasabetubexatejasagojud.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161439c5e0176c---donuteto.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/83002416921.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/kesuwodanogogoxaraz.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1f231e0b---73192043260.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde7b7019---worepelofemevoneruduf.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/fewote.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4a541c08---dasubokemegokorufo.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/39882365760.pdfIn PDF document text
    • http://apart1day.ru/file/84137159416.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/57661972113.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411876d0b79---fagiririvefetebukegunu.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/mewuzegigop.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/dubawugefaroj.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/29380481822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965400f24c---12703073561.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vodijenopedatom.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/vuvoruda.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/6157653517.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/bobumowexoxusexalowomebo.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/riwapekagulifeton.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what%27s+the+difference+between+android+and+iosPDF 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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10780 bytes
SHA-256: 0b1d4a6d3978ff85147228d5908c5616a1b9028105287d63a6eac4a5bdf7326a
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 20048 bytes
SHA-256: d5ad59d920e7eebc47d6a1e4c9b129bb3057a35a083ac31160192808bbdeb7c0

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