Malicious PDF — malware analysis report

Static analysis result for SHA-256 649e2a154647b35e…

MALICIOUS

PDF

137.9 KB Created: 2021-08-09 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1a6975510f9c33560b04a0e96e89fd3 SHA-1: dd68a2070fdf2c3c3ff938891a55514c66d5edbc SHA-256: 649e2a154647b35eb72935cfc15e04de4b3240213a9c05a92c8cf6225fea0450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=how+much+does+a+millwright+apprentice+make+in+canada PDF link annotation
    • http://otoozevran.com/resimler/files/modexevobalo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a5bbe82e788cc249ac4b294e7ceb51e6/54644303637.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/73729872294.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/soxeruvuduxo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/petesazivolefexope.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bd7591d7916a0cc9f7bdc7e639a6229a/xuxovabi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/31558528894.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a332a98c302---wamizezewedesiwu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6sl8qnrjjfnikf5om6bokj93eo/9394690143.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/46c37242fe700fe7448ceb5c3004b657/wizoboposor.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nasaxatewar.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/10224192446.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/53982213218.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wemudub.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/perijizubopunetovawaligo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074ef7d5ef---vetezepegosetejibiviw.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/salenuxojodi.pdfIn PDF document text
    • http://tianfonmm.com/d/files/34951031089.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e308932264---resafojonetasubesok.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/55bdbcc8ae3edd657eb813aba35d6571/pusomozapajokawa.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210720_123320.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_off0001b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5EB 18492 bytes
SHA-256: cd7be5002d39a666f10f599e2fedd95402b85057e16d3c4c0c3c7ced139c6764
font_01_sfnt_off0001e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF03 11228 bytes
SHA-256: b5c8ed17a063a9527d409e9728bc4176edd13b801014e50867c74d8f7d34983d

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