Malicious PDF — malware analysis report

Static analysis result for SHA-256 37745443a17366b4…

MALICIOUS

PDF

80.8 KB Created: 2021-08-27 05:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7cbeb55efcb44ca211cbd664c720fc88 SHA-1: e55f7d97be33f6bd7e8239ce0f0133574f289f21 SHA-256: 37745443a17366b423fb36af2c195cd5b6fbbf60816c8eb2a7fbe3742a54a9ff
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the PDF point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious files. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4369431ff---95127614191.pdf In PDF document text
    • http://coytex.net/ckfinder/userfiles/files/87105261068.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608486d395542---9150093046.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/15838476518.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/54067437910.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/45812107999.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/36393189435.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a02fa03a3---77670908389.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab10d2205---jologitigumepakukinojuji.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/3685681909.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/31243838625.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b7e1f4f571883f28f13b3be626f7b7fb/18943863827.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/35361342157.pdfIn PDF document text
    • http://limoride.net/gallery/file/kopaxolawuteroxebi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812c2dd2aad---gufevejatufeg.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/61795149052.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3331156edea435829d64030304100700/rodarobivalu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076988b76f73---89859965718.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072308022151.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/kudabumapinigeriz.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_011259.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/igod3hqqun2or3g7s63e8a0noj/42598244514.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850764a185a---85307934270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=they+call+us+enemy+pdfPDF 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10652 bytes
SHA-256: 6fbdc4b2d3c9b9e063920f9fe3f1608b9ad493d49e4ddf83f841b548283c6c8a
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 17348 bytes
SHA-256: d094e955676a654a5636500a7b710938067872aa168ec251b34dce76eb5dca32

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