Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce65cea07997beed…

MALICIOUS

PDF

83.6 KB Created: 2021-10-06 17:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72acc3054526d783ff4eea3fd2a439ad SHA-1: 766efd58457750394a8b60f5f27f4f751789f3f3 SHA-256: ce65cea07997beedc63500a920912c6d905185a2c93294ae0a0748e5d953dff1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=dhoom+3+movie+download+1080p
    • http://hnhappiness.com/d/files/32644845714.pdf
    • https://ordermorestuff.com/cmsCart/upload/file/80082959982.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/xajinogimapad.pdf
    • https://vinaconexmec.vn/uploads/news_file/rakevipatofokebadijolukep.pdf
    • http://studiolauramoschini.it/userfiles/files/lesipovuzixikat.pdf
    • https://worldpigment.com/image/upload/File/vetoruwenijavamalajude.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615d9d7eaadfa---bevadukobusijizenadunoz.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/fijiviwidised.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popogesowekamav.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cf25db63d53dd95edfaa57dd6a6f4d0d/73743294800.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/dbf0e93bbf44629b4b7c87a734ce287c/94837139787.pdf
    • http://propertiesforrent.com/userfiles/file///49990475225.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bafc6b9bc---tomenoxoko.pdf
    • http://gabortech.com/admin/file/26433649128.pdf
    • http://freestyler.cz/img/file/71059310561.pdf
    • https://gulfb2b.com/userfiles/file/fipagesadodub.pdf
    • http://moiarchitekci.pl/pliki/file/kenot.pdf
    • http://inlovehuahin.com/file_media/file_image/file/44266612120.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/78828810936.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japadovo.pdf
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/34865907479.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb4db201---vixeka.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/68jsrr9rog6kdaa8e76nkbv2j6/73709226913.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/61534816270.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/51501898051.pdf
    • http://dobrejaja.com/Upload/file/21639914759.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 16792 bytes
font_01_sfnt_off0000f5f4.bin
b4962123ebe061ab33e4b8648ca531cee28f006c085d82b804849fbf4c85783c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10996 bytes
font_02_sfnt_off00010f59.bin
f54366b7c3ad1bc769807d3985dffdb41e8b4ed20efb7bba4acf6df6eb661a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 19068 bytes

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