Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5d8ce25e357dff…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 10:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8a0bcc67ba46b423ec06af17c5a3fbf SHA-1: e8ec7d6e53cef405454b3ba10395927ad9899e5e SHA-256: bc5d8ce25e357dffb1f7238d891a8235ee951fa46513aee5436fb679028aa8ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kutscher-customs.de/gfx/userfiles/files/lawepibotivatenezoxetiv.pdf In PDF document text
    • https://techson-cctv.com/upload/file/81791565414.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/kasowezubozujokojupezer.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fivinazejedogafivovabuz.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/povuwamaduluwavajobikep.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tozuxopijamarivu.pdfIn PDF document text
    • http://hingliltd.com/userfiles/kibasatipikozesitanorega.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/g1euoprtdkdaj6h8e8a5qtvs3n/kutujivubokuvudatimunaxi.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/65812147357.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zuratuwepet.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80677210140.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kesamobofu.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/59280564892.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146b65110800---46709078185.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/280052794.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/42873469369.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326b80506b0---kenilimuputimolorujosil.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/malajat.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/navut.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/41808811879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+gba+emulator+pcPDF 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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 17900 bytes
SHA-256: 217495ee707e88b953981fc395f6a9281d1c36db410ad884bf2d2e7c13232ef9
font_02_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 10788 bytes
SHA-256: dece7397c2d5e43e72f37dd860623322e0567ffb5ca3004017c47ccf097034a6