Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f7f7b57be9ac5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 01:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67e9f4f7a91626835a5ca00278bacccd SHA-1: 2a3eaa5d6ef2c30d3fb12afcadb295f3ecb598c9 SHA-256: c08f7f7b57be9ac53dfe71ce506ef0ac35bfb5abc3ae55a8184b52d2c49b51b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of URLs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://nwhouse.ru/uploads/file/wuvusej.pdf
    • http://gernano.eu/gfx/userfiles/files/99082791837.pdf
    • http://ibnuaffan.com/ckfinder/userfiles/files/nuxonugemotuwobuvo.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/72011078920.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/24550816628.pdf
    • https://divinenine.net/userfiles/file/sulumu.pdf
    • http://amadpich.com/userfiles/file/14446277752.pdf
    • http://globalbizkorea.com/userData/board/file/nibelobukokepapo.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/tetonekalijede.pdf
    • https://loctra.net/userfiles/file/4356102296.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135dee112b09---dilak.pdf
    • http://ed-union05.ru/files/file/86474692360.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/sofowidejezomujiperopo.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16139e785adeed---10166201865.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3da36bff---nakudanefejusuleki.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0eb1af562128a69f5d390edc3c69e579/39797275532.pdf
    • https://rentcar888.com/uploads/files/202109061707502987.pdf
    • http://polishingmarblefloor.it/userfiles/files/4023280526.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/68835628629.pdf
    • https://maconlux.lu/userfiles/files/81345365700.pdf
    • http://thuexedanang247.com/uploads/image/files/bamabalaro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+change+my+lock+screen
    • 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_off0000cd6c.bin
50f3d208903bdf0e346e58db05d3325e7c2501c1f02aa61e2d3ce8daa351a92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 11000 bytes
font_01_sfnt_off0000e68c.bin
654935a3976d3ae0fc3c9ac6de7733014dd598bd02cf1ac53fe1415356bd99fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16812 bytes
font_02_sfnt_off00011226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes

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