Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f19330d4c95dd9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 05:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5117f9987e7fd94f681e43cfe8eb883 SHA-1: 8f1b3632f905666352e11c448756c42639f57edc SHA-256: 43f19330d4c95dd93edffda7e55118a6984d3955f876589fdfcafc1e7241a94c
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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The file's structure and the presence of link farms indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c27cb7acb7ac31953d76674e8ebb040e/likotutunutoluwepidunura.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b81423c5---30480201855.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f405d6f41b5c9b1e64cab3ccd48cc97b/88692610957.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/nupakerofofa.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/3162398435.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6023151a5---tamibapowefezav.pdfIn PDF document text
    • https://motacademy.it/file/noxawumub.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kazomedozotur.pdfIn PDF document text
    • http://feg.vn/uploads/files/74022563416.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/89369851149.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/175e6733448226498bd5fd7eb2b9970a/12094061891.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/luvimitidizereri.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/72189795800.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/todedamo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3f258763---38889028901.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/39499448585.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160754d3c5ee51---zigejawesukujefagavu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/kukowasemimexijameselutu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/pojowaxojetureduxuxi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6hpg3vgnd64vr5q6godli61lh6/36673139793.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125421887ad7---gurafonu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c752351ac40---ripigusipadotaponajezirin.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sobeziratev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=game+launcher+free+firePDF 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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 18060 bytes
SHA-256: fb5931adad0bddfed2425b1a32f38d86d3a13a685781d49b611925f327dc9b8c
font_01_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 10356 bytes
SHA-256: fe2e27ddedd17f9c76ce0030e9e10e392dd4b89da1c7f01fbebd2ebb9ce67464
font_02_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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