Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c27201e33a2de6…

MALICIOUS

PDF

92.5 KB Created: 2021-07-10 06:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 60e0eb4b4c1825c0c67b92d33b992bf9 SHA-1: 6cbd06e356d2815f31afce24ebb96b7d6098b1dc SHA-256: 91c27201e33a2de6722e12dc920c47434c2dcff12dad89cd8b7d308bfb04e35a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b995edaa4---gabesi.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4861d88fb8---viraxe.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nisafakojubupawowuvi.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nulakuj.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/52559841447.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xuvinebanexofazi.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/18597729067.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bde0601cd05---67189278775.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jubozokirorikaxu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f6372a84---regubuvozexo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a6a0df9808aaa32ce004141feb841e57/mulipasazigut.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/fivebopude.pdfIn PDF document text
    • https://fallsplat.se/file/buwutu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/52030086367.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/86568717440.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/noxevoruwu.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/91ceeecc0073477a46142a53adffe798/lemilipadatemixetem.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4e10f94b089fd9e6a938ba0f65ea72c1/tofabew.pdfIn PDF document text
    • https://telenovella-bg.com/files/werodari.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/43199eb62d528a5750b77f59f141a62a/45483196164.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/81416151381.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/83706926429.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7b800b01---gitimagapatabuvesan.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d074472d23---3489228663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ron+burgundy+outtakesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10776 bytes
SHA-256: c6c57ae0eec9c7f1326225e3b2f6b191a310259da840e9304f3310676a90cd0d
font_02_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 2848 bytes
SHA-256: 79628c2d8dfff5e9534088b8498acc28d03d19bd68cbc41eb3361a5c1712da6c
font_03_sfnt_off0001372d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 17328 bytes
SHA-256: 1fb0ed961a52d14f12bbadde1279ec84652600c4244893c0d5f75377a20da908