Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e40aeaa88346df…

MALICIOUS

PDF

91.4 KB Created: 2021-09-03 23:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e223daccab0a7e87253ec35ee02780b5 SHA-1: 49d4adf48149ecbfa0d3c4e5f7947dce53d1c7d1 SHA-256: 59e40aeaa88346df6d01451dad57358a8decdc2484f4095de554ecf61b4c7e00
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b61186be5---gajijokapumunaditorapodi.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1c9db390905c60afe8f4584ae2a4e3a5/28925792088.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/72530039889.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/widavumozoz.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/50314402807.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/78lbg3m4u520o6osck7a9ulec5/25200136087.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e526a0958---54716271146.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bfdcf356c---33685333038.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6e455b0bc---77906780399.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d738d76fd4281543457300c2bad39b7c/defodiresofa.pdfIn PDF document text
    • https://mmszke.hu/files/file/40929306796.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/55658962403.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/pesobiverorowevasifapanak.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5b38ad94---zefivabuponib.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91ec958bc0---tozigididafobupekuki.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/20893724669.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/26239283353.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1vt0h7rnvctr3fi1jh2akag3v6/revamig.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qaa6pvmrlqhc4sc448q1f5gc87/97410729551.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e3fcde0231a.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050900570729.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e682472620---zogumuwez.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/73152893215.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cf2kn3ljf4lcde8jefcq759rb3/40078655437.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea1078b5b---32376139401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=traumatisme+du+rachis+pdfPDF 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_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 21176 bytes
SHA-256: 71d54bdbcce20ef324d86bcf238510ba01aa1c3c0aebdc04511390101cac46a8
font_01_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 10680 bytes
SHA-256: 483fc2e57d9d320dc31f5a0804adc14cb96ddfc5158040bd3e24bad89ae4f56e
font_02_sfnt_off00014801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1