Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe680a5c5d740c6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 01:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf99838f49d754ce238b966bfcdbbf98 SHA-1: 8be0338626b5836ee935142e08c8f04d8b82ed52 SHA-256: dfe680a5c5d740c6321db18c0e0fe0908504ef50f2d8e41c4c995a7fec836024
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of multiple links to external URLs, many hosted on compromised CMS platforms or disposable hosting, suggests an attempt to redirect the user to malicious content or download further stages of an attack. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan-based attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://medvor.ru/uplcv?utm_term=best+mp3+cutter+app+for+android PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135264c47441---woririsatogajaloxinerado.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zewapiwerinavaragakitixo.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/5518248790.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84059817224.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/92239684581.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/museradupazizilowerejadub.pdfIn PDF document text
    • https://sanagustin.cl/files/25832454790.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/lomotelavifenakironedekav.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/rakufateweravataruru.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kaxanufeniwisukafetuxoliw.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/merag.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210908181634.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/31344090997.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kunozusagokewiju.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/sejuguvasapukotuka.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hjh37nnhd7b3vngc9apmhrqdq2/66141631137.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/37681376340.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/poxufapireguzobezi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f8964719---wulatabiregepiletupi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduneropidixerejojejabe.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/83004480246.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 11060 bytes
SHA-256: 230f280d8a771b9560d5271d38edda7500958d399da7d6d506ce972e421ef0e3
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 17816 bytes
SHA-256: 17592b042cceb515728be889e8f564472b82a89a6035ebb1832a7a47b8aa9ff1