Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8df964c9d10c7fe…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 19903ea184588026c6c075c2f27a7462 SHA-1: 1c4439e53385fa8a71e6f4d83493154e01410e43 SHA-256: e8df964c9d10c7fe552b48232fe8e15fd2e50601476985d07dfbacc809297e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary lure appears to be a fake Windows 10 installer, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://infrive.ru/uplcv?utm_term=free+download+windows+10+installer+64+bit+full+version PDF link annotation
    • http://hawaii-resort.info/images/blog/file/69807574647.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7ebcd00a5---82282386478.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/29639244429.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/2656080891.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5d62409ec214b0c57ab5ff5ddfee9506/vipupivubapope.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/616401dc178123cd9384c18dece2635d/nagevaxemurujofemajab.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109041356521547.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2cbf090e---28690858437.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ccfd40eb---risutajuvimimobilomi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210922232921.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/53627242064.pdfIn PDF document text
    • https://tckontrola.zagi.hr/files/pilife.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/xuguxozutu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/zagedenawikusipote.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614bca540c835---serewomekepofodexa.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/vovelarolixum.pdfIn PDF document text
    • http://full814.com/upload/files/4841339980.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xerojemivapisituxekaves.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/22156061387.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d94940568d75227eb1df80bac8b400a7/simotolonodovis.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e7fb7418e02b0290180f0f635f416c3d/44660668621.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_off0000b058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB058 14912 bytes
SHA-256: 9c35c765e0ebcb3ae9d413546e739aa7e762a4d35a70aafc151fd5b2967e5b2e
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 11136 bytes
SHA-256: bfde18e93effe84c478de6c401f6ab6ce8447e4cbfd8ad4fb7896686456cc34f

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