Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9ce349b57e1cdf…

MALICIOUS

PDF

94.0 KB Created: 2021-09-01 15:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 055ad2a02286d9858eec7994fa808bea SHA-1: d573f6302ffa4abfa436a49da5ebec9a025539cf SHA-256: 3d9ce349b57e1cdfb00b2b88b3cae37095a1983b3f4503c0b504520ce153fa68
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=the+perfect+shot PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b529b62c---supifulibufa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a706f5ba0b---balevoxejagajalu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ziwabonevebobajove.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/56323399409.pdfIn PDF document text
    • http://marketingnews.fr/images/file/11238751283.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/kusuxaninilupedotezaro.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/rawafaxiluzaj.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2db998467---wozibodefigaletojux.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608447afe7c98---kodivajebudanewowibisodaj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/golipikivedanunes.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/28219253583.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/fibisefeg.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vixeliluteloregixumog.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/zugazutidiwow.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84d61c6b3---mubekifalo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xosalovuzuwewadi.pdfIn PDF document text
    • https://bfull.ru/uploads/files/vuzagoxibopowat.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/baxewiwop.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/94716103697.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/24268794955.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e004fc031da---85686886947.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/fuguzimiko.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_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 18052 bytes
SHA-256: 31a728fa00c0c5905c449a5f08cfb6b34d21bbe9044181b96009854b0e5b2131
font_01_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 10136 bytes
SHA-256: 0cc3ee9de4e2298e966abc428418e47a66666ff9dbc9670aa908537bbc841303
font_02_sfnt_off000151a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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