Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b36a19c54fb7d3b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 07:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 019ab8e8bf27e0e4c9a47fa40a2be247 SHA-1: 1b95338eb033ff9646f6ebc26aac0ff245c3df16 SHA-256: 8b36a19c54fb7d3b6d66d3479369a53d340f652dfa5491f89f041d27a4cc46b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's part of a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=barnes+and+noble+nook+user+manual PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d940053ea6---porojugokanitagufiset.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/862c6af982ed8d10b14dca74fbc996c2/76589810443.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/msk49ogaqbgm3d0f2p95lg1eph/kafifi.pdfIn PDF document text
    • http://zae.me/datafiles/file/kewojolarowaxizifosij.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607767a9845ba---14093917502.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/72930025672.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/89046288854.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/95876935163.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/pu22u9eih7mmlt4oet78c02ip1/33083696154.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/73905468574.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dfg4qldl2dq3djlq56vboc7dgk/xudebazazejutadudekopus.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/wulujokux.pdfIn PDF document text
    • https://altbuket.ru/files/faforolatujalapojatewitel.pdfIn PDF document text
    • https://hirurgija.me//files/tuvifujuderek.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210629_94282.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8120593a3---gulamebaxu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/90cf87318f83f7d841b91ef8579307ff/68709510780.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/2916854064.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6d29553c---kixomofomane.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/98ab1102bdcbc8347d5fa54ac56abe0b/bisofubo.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/27103507209.pdfIn PDF document text
    • https://wecareprogram.org/images/file/33243073218.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/vbao8dcjnmu1790b93hsi82m6k/70061938881.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ad201eba4a3bf15a98a1b3e279d95191/28126280204.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/mesisetiketesamezino.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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10604 bytes
SHA-256: ff74356791665db269c5a47b65abf1404dbc8d2667bbb541e7c6d5cc3a5b3303
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 17224 bytes
SHA-256: f4c2878b0334271cff58898e478d729aa220db17c975d1dbfcb581480d93e5ba

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