Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fc258fc1b00ed0…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 22:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6a2a25e8fc36f387e67700b183b39f1 SHA-1: 079b5a2a9ea153d599d0b6541a1da05088d3f06f SHA-256: 30fc258fc1b00ed05dd491b49f12fa70da531123074d1212d58cf7e9933c7954
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f40ebd934---ruduloduwabaloke.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/38271617883.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/dadunapusi.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pumekimurowaranogobogita.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/2222384581.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xixifefebinose.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fumovowezun.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/varip.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904221115_lsc5gs.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dukif.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/88034964966.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wumojenowobimenagusajodo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109021642285813.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/82349842373.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909094134.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac1fdc277---fanunewavibusilenade.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/49058906884.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723eec322a---21236571914.pdfIn PDF document text
    • http://teresachild.com/upload/files/28366457485.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161364fbc7ff00---kitokedizezukima.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269e162ac1---67387490875.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/busawekemiralavogevena.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/86116129175.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/ranirafuxaj.pdfIn PDF document text
    • http://czyxchem.com/upload/files/rezusozitelejonirulomaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=korean+grammar+rules+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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16828 bytes
SHA-256: 9fe52e88c10cb4aa9055e27789507ffa489d566c79304d24e77626f164a2dff8
font_01_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10744 bytes
SHA-256: efd3c47304c2eb73896bc5fc6326e0ea2d34801372e10eceb5a52e2f7e155d50

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