Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e6a37063867afc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 11:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c25278ad56bca845909a798ac53b09c7 SHA-1: bd5ce8deb3f3cb9fc3569e3185a53b9c94c62e31 SHA-256: d3e6a37063867afc5b5bdc6064a28372d78bab6969751847f8fd6c1f90a27a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the URLs and the overall detection profile strongly suggest it's part of a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=android+r+java PDF link annotation
    • http://gianniarnaudo.com/userfiles/files/59005259381.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/bozewumajevadekez.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/83906692958.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080719563546.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75346510560.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61d23c63c---nivemeligikuxemefo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vimakojaxexifuvo.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bezudofadefuwid.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0ef76d0c---26039579035.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/wonokosamarowezuwobu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34edeb624551cea102bbb1dda68bd281/66969695283.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/98464754112.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cf427b947afec7a0c7b1f62733e81dc1/tezebatabu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/94069463946.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/nuwiwafedewarixosubupo.pdfIn PDF document text
    • https://bdata.vn/upload/files/zemobisesogefavamog.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/68897930987.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/sofekovejid.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a4a43c0bbff6753c5dfdac3956381521/27303653867.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/setedudikotemanogi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wazuw.pdfIn PDF document text
    • http://vizcsap.hu/files/file/39192363650.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/20856846634.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/10880492755.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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 9972 bytes
SHA-256: 8efafe7c24e152f049f702ef708673138b650b17bbec81425cc0a1a543c5aa29
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 18084 bytes
SHA-256: 9cae36fcbd3812b47071bb0d7e9a2bc348e9c8fea671b0d645fceec70a2cb95e

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