Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b51f5b598268d79…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 19:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdd7c53779607abc5978d1a72689ce49 SHA-1: 29a98a50774877d2035cb4359920f67c1125632e SHA-256: 9b51f5b598268d791452ad7155c49858158855a4d46642c79f096f7bd13b469d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bora.su/ckfinder/userfiles/files/nobadesodavulogelemegomix.pdf In PDF document text
    • http://toptoptraining.ru/img/upload/file/xugixa.pdfIn PDF document text
    • https://harom.ro/files/file/nafuwiseza.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea64d1de10---xinelominatekigefevumaxim.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kekekuriduwanul.pdfIn PDF document text
    • https://yellowstonewildlife.com/welavadulagaxagupiborete.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6950927---95415580728.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9ee2da79de5ef8be1097ecf0d4b8f7c3/waxixumidifiwaliz.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/koseluluravigele.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/rudokawamijisimor.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/21251556129.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/kusejetug.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910093743.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16317271851486.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb18cc61b---kukozevojerideneler.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/bogosevi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2752429958.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/41726182167.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/ximewizalilelirididale.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/43159324760.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/nigejixojujexow.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/18231859981.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/43164876317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=my+factory+tycoonPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/fagilol.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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 19124 bytes
SHA-256: 468f76f00afe4d0a9cbcf34f978b2ab38c3e8a172ef31bd18aa923fbde8bada8
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 9996 bytes
SHA-256: 7521654bfa0e694e4d12205f7401c0a3d7e345075aa93a8fe8d4780f60ee19d5

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