Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4161c8b187b48f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 01:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a98c38453db468902718225802182e SHA-1: e8a3bc9b862d1d46ac322138a8e9220dc3d923ad SHA-256: ac4161c8b187b48f98e0a7e02f38f8445df3a684210d9536e73e07a784b7ea98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://rtvpuls.com/ckfinder/userfiles/files/17500496126.pdf In PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vivok.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/ragavugefenefesarekugaj.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/15730272673.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/gavodefivuzedudemoxebazor.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/55466483513.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210912000143.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/33303085914.pdfIn PDF document text
    • http://artio.pl/files/files/tudoxevodegukow.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/kql4nr7trbdpqmhr14k8icllp6/bibinazasojigaku.pdfIn PDF document text
    • http://video-cycling.de/files/file/33080275604.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/jemeguvigefaluzu.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/30313216217.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/93337108560.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/94361467153.pdfIn PDF document text
    • http://philipsphotographystudio.com/61349131279.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/10937727898.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/54289061599.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/98656894844.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/57863443588.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_62BC4EA8FD60E9B6.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tamazuxolunevibebimenoz.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/zuvagojamilatazogapewo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bdc2daba---58453692762.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biruzusilavifuf.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2jitf6fdvhdb7fukif34vc5457/99046646689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=idle+streamer+modPDF 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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 10164 bytes
SHA-256: 2fdc310ab2e2bc996d1c05dbe8433be5206671bb22d3e6613917c121a22d9124
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 20748 bytes
SHA-256: 8ea19a378a605fed2e346aa0731d380acc2aaf92409ec927fb807fd26d8ce684

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