Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cc507ff66e7379…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 15:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9021b28c6ff72207be5f6e12ca5c6d66 SHA-1: 7127a3cd31f7f8e650cbf7faaddbbc9173787d37 SHA-256: 20cc507ff66e737933fbc8d0a42f932186e29674ae8ee4d62b158735219f20cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm on disposable hosting further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=sodium+fluoride+msds+pdf PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bf83f534---89975872113.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6f4c36eb2241f2054838aa9bb4d711a0/gakog.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/suxilukaga.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/84040743722.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7abe05cba---2465957379.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb50eb7c1a---daxolabodutuzur.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5vhtmekop61vrrbq49ul9pakb7/93983058280.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/5991108716.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5a7d58982b8f0381065362ef92825ef6/veros.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/87923118557.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/ruxebuwuxodudenuzo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dilunoroviturigixawa.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/2655791795.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/xolajadurop.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa67dd2cd8---gotomusatalejedugoxezabu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b3a5b3d5---tidalekimepuxozofase.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/73054830023.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd64bf750---40617187738.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16118ac4a5aa77---21911504839.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/246b636319d34e49b7e209d02b89ace3/ruxobu.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/deniwexavuso.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 23196 bytes
SHA-256: f9764d07dfbadb5a5651eabba96c764e13d1bd616cf66d8f15233583b79c8c23
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 10472 bytes
SHA-256: 5252975dca5efba95132e60a2a73c3b51dcebd7fb91461229de9d6c4d9c82800
font_03_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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