Malicious PDF — malware analysis report

Static analysis result for SHA-256 820345e6c3f13050…

MALICIOUS

PDF

85.4 KB Created: 2021-08-21 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61d7455efc868bdf3ef3601a465236b1 SHA-1: 941045a4f3487482a66aa5ec503ef3e6c0e85dcb SHA-256: 820345e6c3f130504d30d8e018f2d3e5327724559390d925622467babb0e6f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://proxima-design.cz/files/file/nuwojajorulabo.pdf In PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/44562931795.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d03045a2d---nunizesa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/57958836632.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dd3163f7---kiwagibavaxabi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c037205a712---14690943477.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a31293f2009---4234581237.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/guduwabifel.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/62543260281.pdfIn PDF document text
    • http://metallpress.ru/files/zopovusawodemid.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/78411000313.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jeroju.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1f95e3ece8ffe6b555a9dcf01ab831f4/xabowaremizopifexexo.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/03aa568d1596c2ad2a708443fcdfde57/793407789.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/zalemotux.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/9526932771.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/62728345875.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/4705456447.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/61634357631.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609209a818767---vapixezij.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/39599745727.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/37117466413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reset+trane+xl824+thermostatPDF 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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 17220 bytes
SHA-256: c546aad06ce3bb5c60dc2fb3ca8840f2072c7763734001bbcef6fe0d31b3ae46
font_01_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 10868 bytes
SHA-256: 7b183d6ac0a47c78906cefeb858226e35e9bb715806700372514dd7b4c9ff43d

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