Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc42d9821ac491a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 12:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 778cdc69b82aa7c7b30385f0485e00fe SHA-1: 20754375b7f76c857fe4b6553413aa30a7fdd1d6 SHA-256: bcc42d9821ac491a2606ba5d9ea5e6beaa349ff1bd833f4d6aef0f65d69610a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a large number of links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13657884086.pdf In PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dewelexufedelo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/5472515533.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/tapiriduped.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/besozotiremupubagejaxij.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/masetulifegiwomimosoxoxo.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/ziwigegonopudif.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/51941204535.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/gijonebetomox.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/25126737035.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dfb15299fca1b55e26f6d8ad714b255a/vibusenenis.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/37187209360.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/molipefugezegetozejux.pdfIn PDF document text
    • https://austarpharma.com/upload/files/57891778783.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/37304442239.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42509852732.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913121321_1547902129.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56f35d021---65562539698.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/14881530206.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/66358031823.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/4677387828.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nibamotuzezaxerituli.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f19a0988f---68235522853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=thank+you+for+the+cross+lord+lyricsPDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 17108 bytes
SHA-256: 6d27cbe95ad6559f3b347b9f601621d14c4b2157e7ac2aead1df688ed2bee3b2
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10840 bytes
SHA-256: b5b98eedc0f1e5a720e0b9c7522c61dec6ae01d601024e80e714515c16cd481e
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1