Malicious PDF — malware analysis report

Static analysis result for SHA-256 7425dec7e3645dd5…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 09:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a0a4c4e29c222a8bfcbccfc7f5bc7f3 SHA-1: 7ef52a2e2e3985df1f11fa246d79d88b704a570b SHA-256: 7425dec7e3645dd58091b5bd95dbfdb3527c287ac3ae5b6ff0cef5a11f079eed
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a 'download button' heuristic and the extensive link farm suggest the document's primary purpose is to trick users into downloading a secondary payload from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 https://wastran.ru/uplcv?utm_term=free+vector+pdf+eps+download PDF link annotation
    • http://sobinco.cz/ckfinder/userfiles/files/83939307482.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/likiwerur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee624ae74---50370381118.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xumavemexibagosuzelibup.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dc38373a---57768917817.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pituwigaj.pdfIn PDF document text
    • https://loctra.net/userfiles/file/69524860382.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210827_458F9F77EE6285B1.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/87912604074.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd77da428a---tolizavumekada.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/joxipigomufotiseposeniwif.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/givaxatudufadimer.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/dotosurakozerekode.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9d1ef8a5---mevevu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0l26krd46mk4usort52bboa49d/vulanisifibibotevemem.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/37054775971.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/botedagekurawibagupalif.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/berilov.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/83087732918.pdfIn PDF document text
    • http://chipgene.com/image/files/20210701_141455.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/rukogo.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/tivemowibigusemalojogagi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971a4326d7---petowibokedopoforez.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_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10648 bytes
SHA-256: 61769b79db00291b8c9c7ccc3d4fe546b4f44ec4a7f61a0f16f5c5c8e20a7c57
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 17976 bytes
SHA-256: 8073abc27b017ac8d763feef4abbcac54ab0ca3aee9eb628f938a095b5e32b19

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