Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5819e8bf88dc5e7…

MALICIOUS

PDF

87.1 KB Created: 2021-08-29 20:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6efd73574075850215507957941fb98 SHA-1: 6b007016e8672ff07d206895c34dbc2ad3f33229 SHA-256: c5819e8bf88dc5e7a36db9711d36cd20b8f06d02782acaaf0d7a9337f944d1b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bobiniauto.com/userfiles/file/nikadowegigunoxin.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100db0ee0de1---43848121431.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c10df1890---vikafimemekule.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/bexazezasalojuseta.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/12748572928.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a687a8812d---17798468027.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/83062412508.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/natitojetiw.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/69010340736.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/petut.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/latem.pdfIn PDF document text
    • https://moolans.com/uploads/files/mibaf.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/63811595565.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b730112b39b---75558492324.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d186bb04767---sokavininadogesaxin.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/37650691009.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/ninep.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7srdk47vf3f0dau57kn213g0ui/86288008140.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dcf0889c7---pimabizifaporusewowet.pdfIn PDF document text
    • http://skncn.com/u/files/36195694541.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607415f6cafde---67276083309.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021616237487351.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/90374225145.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115998bace82---66954498139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=across+tamil+meaningPDF link annotation
    • 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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 10552 bytes
SHA-256: e833a7f6136abb2b8ad03d29f79d7b343bb4274a30a6428e97f3c87cead2dcde
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 22760 bytes
SHA-256: be2b134103c1a02a67ac4cb7e2d231ca3c8a8ea5ed416ef33f8ca08415efb0db

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