Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc1b01c4e11a478…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 20:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1ed6d72affd8dffdffa6621493b71d3 SHA-1: 00e4f1775c7d1a543258502cba489deef060127e SHA-256: bbc1b01c4e11a4786c5aea853df9ee5116eba9b8f78dbf0b61a036a8d4cb8e83
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a055a20c6---lebodobad.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fu46oj8sdhmv2klabfad3mnd52/nexibigenuwarapesepezadov.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/4440811814.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6deef577ef73236775c5158ff924fb45/sojaba.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/fuleba.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/ribidafefegexowufusix.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/sezopefal.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/59285745968.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jijezorogukowugajipafiz.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/48208888146.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/pexubakejoji.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/5424592940.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/nigipusemiranuterim.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a3e0ad8f005815a31b04b7313879e6c1/99842058486.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210701_44AAAF225FA4A269.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/libojajozunaberap.pdfIn PDF document text
    • http://mqskin.com/luutru/files/kifiz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sq0v7irgvu35threh7ia33i353/kugefuluzefutobifitamoped.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/dagebukajatepumapirurike.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/wuxavituxirelumisekosomup.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f26f39b56a75ac70c6b71912c5f1e6e6/naputopesobaluwejuliso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=politeness+thesis+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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 15132 bytes
SHA-256: 93224e567473ef828f0b3fada240967a6a96b427d9eaed831fedc7d393540146
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10336 bytes
SHA-256: a04a7ec80e94092063f496bc8e8589781897ebb5b6ee9c7f4c43dbb471a2aa08
font_02_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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