Malicious PDF — malware analysis report

Static analysis result for SHA-256 258c21229ee511fe…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 21:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92ddf2b0cfc539d065889d34da850518 SHA-1: c45195a619767b6453b5028befc30cbb881c01f3 SHA-256: 258c21229ee511fee34a2a3b5b4444ffeaa00c044977a51b4f2ba92c8f1511dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe0879b5---zexafunomewobosogax.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2po1e6d4h3ksu2tren2bg1q5qn/78685416870.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ei38riqkr0nh2jrmhk4drtp7hc/10508858936.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/xisefegagumesoduxe.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/59284961371.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/jogibiv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cee87775aff---20673695439.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8650741f8---74467111145.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46150b2554---furutitikojozuladodaxe.pdfIn PDF document text
    • https://kawanmto.com/contents//files/tekufifixa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae503d70d7---pexaduxib.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c855ef04c9---todefujesulutojudunufir.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b83049bf---75810488904.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/jasepatezajabemebezewev.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/jobuwa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4dd1609398a4f384cc92ea568f7a0e26/122998948.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1vjnqj66269k15lm068mu0qcb5/61055201681.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/narupelobupubewevemed.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/26192044090.pdfIn PDF document text
    • http://cy2hand.com/userfiles/risit.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2c1d89733c8d84cf57c064e6f291bd95/nuzobuvarevezamovevote.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fi4gnrqcc2ucpfp75lre6e54jn/15750940372.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ibfohqot7l3n9vdaqp2sgudcs1/82141485534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=every+man+and+his+humourPDF 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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10632 bytes
SHA-256: faf6a32a76932c0e4fe2c117f5209ab37500f4ee940bc9b85134825855700b8d
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16968 bytes
SHA-256: f8d5a15683335078611be723e9b8795a85c98dd76879a7e02f16377ed449b74d

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