Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2294392a08703a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 15:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 146b32d4ac5bd9c06dcbf89194ab3573 SHA-1: 49ef5ad383b359c8f63bbf8bbc8d1ec2aac0ebce SHA-256: db2294392a08703a9d06836bf906b8348aa9c31a23dc467c1096c95af5cb2803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

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://queure.ru/uplcv?utm_term=manual+configuration+outlook+2010+office+365 PDF link annotation
    • http://dent-pro.cz/pic/file/lulegimuzareja.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108130158589325.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f78d6a2---wutujesorixiwoped.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/vobabizobasit.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9ibqdrg5gj3trd9m0kpd9lvrif/53909190571.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082610ab71a3---jubudajasusobe.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/21852376398.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/pazenegagebugoninanixik.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba72c90f952---27790706610.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074168d5cb36---14982547035.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/19233678268.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/wowosibiranejixorotawozo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a364e9d4f---wawivugegogebonuxunemaj.pdfIn PDF document text
    • http://innersolutions-uk.com/file/mowafevujisipo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/dekedaguwarikaxil.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd318b824---1601502155.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/65565070978.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/bisuzokakixilazerojarol.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/83503277311.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210701_DD696A5D377EB039.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/29222377815.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec44d4a6d6---mugefimonuwib.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1l09od39mpmv2dj2mh9uer5hnp/95976946435.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/b8ub2nk80il31iihpa9lp77184/5204445151.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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 18484 bytes
SHA-256: 4c02f54d4fca8ffebdbb8a31a36e26e8ce82368bb81ec8d9a7354d18cf8bf470
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 11296 bytes
SHA-256: 7a82ec0a6696acd92e9e30880a81fb69668ca1d5a4774629513742cf0b90114f

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