Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb96d3c1fa3220d9…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36decec2cc2f70f4050ccea706fa78cc SHA-1: f0cb00f8a34c1018985d53716cf956b7a6675d38 SHA-256: cb96d3c1fa3220d9f5c45efed857c6bc2796f69df413e7271768e841cc295176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mebelihome.ru/upload_picture/venufariwexirozelowodujog.pdf In PDF document text
    • http://abwmarlboropike.com/uploads/files/surewuluk.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/44ab8c62017eef88115b0121b3c39edf/65745662086.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097c98e9e2c1---kumudifemugak.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/832141599.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9590ab64d6---13259052409.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/82919649560.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/wosima.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c00856738a5---wamuf.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/46635537237.pdfIn PDF document text
    • http://ned.ru/uploads/files/lowude.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2944a6def1---motuwelitosedogud.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1097ecf132033eccbade8880d0715c02/59535710270.pdfIn PDF document text
    • https://lapakunited.com/contents//files/nemuwutiwefovuzi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ur3rbh0jqpu33j9l7v042qqcpm/41840372491.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/gexenobodogexulunupid.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/gupuja.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1d20b4e88df63d674702c4f7f8b5a83f/gomijorusajusopekip.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nujegebavaxekuwowuzike.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/512ded47020d50d3a57f155559b9cdd3/nukajivulepenudek.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0d2d719b5c55b329921865d1335b9c35/zufaxuxaniz.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/677073d4748190477c2846df20cace5e/jataberobutageveve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=unir+pdf+en+un+soloPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/fapidirexiturodirora.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_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 10340 bytes
SHA-256: 4ce38b066fb11bf20d5a9b0822841f78c9a5fe8f65be59c20e720a713371ec0a
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 18016 bytes
SHA-256: 0bfe929902cce52dfc783bbe21b6623f6847036ce4c2e8ade0f15873f1941807

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