Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaecc8b189da428e…

MALICIOUS

PDF

89.1 KB Created: 2021-08-04 17:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2fc34178c237d2bf32e0088f1d47aad9 SHA-1: 04341cb47376096f8a47e64a35108900f9cd4678 SHA-256: eaecc8b189da428ecb55030f9c8766cecbc2abe8068a368d1eaf3e31034cfdf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to PDF files hosted on compromised CMS uploads, indicating a link farm designed to distribute malicious content or manipulate search engine results. The presence of external URIs and the nature of the links suggest an attempt to lure users to malicious sites or download further payloads.

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 https://holocaustresearch.pl/nowy/photo/file/parirujil.pdf In PDF document text
    • http://prociweb.hu/sites/files/file/98179468947.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1584f4ed---57293843930.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/09037f39150a6c8ae5f456ad7bdbad2c/zuwozunebiper.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/735da75af013d96417fa0ba024270400/58114992070.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/65160646872.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e2b8a67e1---78668484503.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/6672214138.pdfIn PDF document text
    • https://securitydm.com/slicice/file/54867683582.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/90813912314.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c013258e7---81276107723.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tadokugezukujenilos.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/15270370934.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ac288bad668fa82b63e2cf8b9941de96/dogedav.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/83205880406.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785305b4177---funedumixedirezed.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1c553259---57538736354.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/kikiliveduta.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/44575326600.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44aea2c05e---bazefanor.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4f116680d8d19959d859393a60163de7/48541581301.pdfIn PDF document text
    • https://alutat.com/data/file/9354538991.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/mikusiliditaxado.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/esvegrh109ouput08j7tddro56/wowolenu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/wugobepasiginut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+printable+blank+handwriting+practice+sheetsPDF 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_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16952 bytes
SHA-256: 98430ffdfa40b24e37ac74296330bbe9541ea460b09f1b770ca19b6cbfaad7b8
font_01_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 10968 bytes
SHA-256: 8956d3f5822f57e4ba232d13cd451b4a35edb6c3c92947e5e802a4afddad603e

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