Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ef30f24244dc55…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 05:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcb40cbbdc128cedf4f25cb95608e69c SHA-1: 71b345de502e9f1493f589b494e34549218edcec SHA-256: 79ef30f24244dc55a8d22936d0a71e8e23f7313bcb562c86121569b1a7b28311
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=21+bridges+movie+online+free PDF link annotation
    • http://5lovestartw.com/CKEdit/upload/files/nobazeserikewadezenon.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c37f1b8d6651867ce58efc950fb317eb/49179213912.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/9033308743.pdfIn PDF document text
    • http://orlickachata.cz/files/files/49722058988.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98114335468.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/mijagimutezamikarutin.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/tizidapamof.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/jofewi.pdfIn PDF document text
    • http://proxima-online.it/public/file/19682477130.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kutarililupixadewixun.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5a0e6862---nudasukafenaladisisulu.pdfIn PDF document text
    • https://miet.hu/kepek/21113936694.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/xevavudetujakunonet.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2e9ed1f---68443212915.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gamobewe.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/58171532493.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/wotutuwovifuwadijapekevo.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/78879741971.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090131311460.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/15148022855.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/081d7c55e491b8fe94398928f981256d/nijije.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134394456dde---digil.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/musokudobimarerupitakasep.pdfIn PDF document text
    • http://goref.ru/files/file/78123742749.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 16644 bytes
SHA-256: 79e79874a9d7036f7cfaff2f3a6b059286fc970d1b090425917d6aa4b14d1473
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10716 bytes
SHA-256: 35a080b02d226f5cda42f155b85845b7127934893cc6b4f954b13338b14421f5

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