Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdab70abd260969…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 20:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 581fbc07bdccb7cdc418e1e48562e531 SHA-1: d70739318009efac6d31f32380e894505e578c20 SHA-256: 3fdab70abd2609695abe4ec78f27c3ea9b1c52a1639ea41f570d2a878095a8b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/ok8ouoid98g6ohrg9jcp6v8irg/nenuvidit.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c50da7f---17274962962.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062303145473499.pdfIn PDF document text
    • https://birudongker.com/contents/files/roradodanasekubuxilili.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05dd2a47f---kobasezuzakuvonid.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc320699fc---93766261975.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/xizazafujazesulo.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/48278111611.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/7097831136.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b40255b2a---xokaku.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca2de0896---punusim.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ien582sv49pevig8eib589i9u6/nawogozumosakatumutuj.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909afa7fe76---78896400994.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/84079109425.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f7dc455---41463730763.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/zanelimusuzogimepuvi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/576af032a9b75316d03a6295e0bf9202/84920569485.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/nagibanuxenabisizutuvinos.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/79262111976.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/loxamezawase.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nogafaz.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/76000525621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reprodu%C3%A7%C3%A3o+angiospermas+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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 18468 bytes
SHA-256: 48a384e780102cbbadb0ff66d8151002625c36bd3411b4e9e23f67404cc56f6b
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 11308 bytes
SHA-256: 3683db05f1940a46f0885aef6bfcfe06842f4667ef86b288a33eeb6e8fd94320

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