Malicious PDF — malware analysis report

Static analysis result for SHA-256 df39f7fbe7917f89…

MALICIOUS

PDF

93.0 KB Created: 2021-10-05 13:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d3bb3987c239828f6cad14eafb88faf8 SHA-1: b75511e418ecc413903edf29d18ad4b1b7bbd072 SHA-256: df39f7fbe7917f8945f6686f4fefb52b0462faa548607b06f5b7fa6838d15c93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=what+was+the+columbian+exchange PDF link annotation
    • https://wecareprogram.org/images/file/lelame.pdfIn PDF document text
    • http://cobmedia.hu/include/13630676814.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/nojoweliwafakevokedek.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911214232108816527.pdfIn PDF document text
    • http://szm.hu/userfiles/file/kitomujota.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/39734032467.pdfIn PDF document text
    • http://lilcash.com/ckfinder/userfiles/files/befaxaromifosojanoz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614673e8ddbb1---rivoxuvejarelude.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuvuzat.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/4357859388.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/tileduwob.pdfIn PDF document text
    • http://airfa.it/userfiles/file/marixurelikiluluduber.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jebatozenozafenax.pdfIn PDF document text
    • http://preiss.at/upload_files/files/nubonadosurubimujivegu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/55606155890.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luledamudizedivunapawe.pdfIn PDF document text
    • http://veitali.com/upload/files/gosamiruvi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151df2333a7b---gawibet.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebepugiburigokevib.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xejaxixoxujajawu.pdfIn PDF document text
    • http://halanmilk.com/upload/files/74916569765.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dd36377ed9bc0395fc468414b14aca78/tapopategamisuvi.pdfIn PDF document text
    • https://taxinamdinh.com/data/dulieu/files/74162516663.pdfIn PDF document text
    • 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_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10996 bytes
SHA-256: b84cbf1f8bc54d7fcfc3ec15ec8f3babc0589e7fc1e5cc6d1b35f789128ca055
font_01_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 19944 bytes
SHA-256: cf64454649f1e8012cf7a6d9951952f60aac2aee30ca8875a2d52623c2140f73
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1