Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d32f28dbd80a441…

MALICIOUS

PDF

96.8 KB Created: 2021-08-13 15:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aff4cdea3277d8ac2b9c714b79b81725 SHA-1: 6f878d3f82aa18a2a0b7ba8b0d42bcdec2ef796d SHA-256: 1d32f28dbd80a441e6fad060155010fe4d0e0802531cfa6288a8753d71fd9268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to manipulate search results or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://senseoftourism.dk/userfiles/file/lozakoxemevigutovog.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0f8e0a51---vopowasodineletojazel.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/velelegaf.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/62345652156.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/kitupatifazu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/somegiwijewozuw.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/rokukarezasalowudas.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ad4ee6f7a7a4c87986aaa76f4b00c575/49740964876.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nijoxunavisawogerojefe.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/mifubexulef.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9219d31589fe2ac9a54cb1f0d6d7fa7c/22141360236.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/sufulumosevazofabizagofij.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/dawoxokujolasutanomef.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cce25dca1a20c7b2e0c97e0c0cf1db8e/jegisufenefixugelowefuba.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67768069274.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c1b9a468af264b4bc860a7b25c6ee38/dagegurasotavogodizikabo.pdfIn PDF document text
    • https://5udua.com/contents//files/nezifiroxotasakoli.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ea80bd5---51710762333.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nvr1af4skjeo4upooakjoj15ou/patovurudaxadexadubu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/pewabuxidudami.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/fufuk.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/504150368.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/60354658415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=baixar+livro+encantadora+de+beb%C3%AAs+pdfPDF 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_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 19924 bytes
SHA-256: 66cbb6df10c79276d1c6fba8af5742ec1f2c16f19ef05b52b4a4f8ac4c26d87c
font_01_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 11136 bytes
SHA-256: fee9a053951d99b65481fc96dea7c29b32d927c6497ee78bf5e6b8a3835e9de3
font_02_sfnt_off00015bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1