Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1617b1d9c6e1a53…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56c7750b93385180d748d559c33804d3 SHA-1: d2ae13069d621055c1499581cd9daec51765ec65 SHA-256: b1617b1d9c6e1a53c41eae1b032dbd0623bef7b4fa045323acb0b4df8e9b0e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=theoretical+probability+worksheet PDF link annotation
    • http://pomelieagency.com/userfiles/files/38117602401.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tifufoned.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jetolo.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wadina.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/dofurevuw.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sefabigafarapanu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20884175562.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/likaderef.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b90d6d899863186ca98c3343e9a506fe/61365957695.pdfIn PDF document text
    • http://inica.org/files/file///wazukuvotafekolesive.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/dozofovewitavawet.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/katujisevetogiworu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312ab8bd1a1---wujikijadisafogagarew.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb8ba8030fe55a42970d2fa57ff73551/75695644625.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/luvoda.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/nitusijize.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/81545391180.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/55723634631.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nijijo.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/purinemumumeba.pdfIn PDF document text
    • http://precisao.net/files/files/figuliguzijivefixu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907163132.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f11b62a7e22e25bfc035ceb6e43d4205/86116071716.pdfIn PDF document text
    • http://www.ezmoving.com/file/24877998577.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 18740 bytes
SHA-256: c885f07b579a1dd0c98597a759e8159b575c307496a056575fbfce485f49744e
font_01_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 10764 bytes
SHA-256: f94cec07eea359684cd141835db22c156e37103faccbd97a54c4b93746ea1f27
font_02_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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