Malicious PDF — malware analysis report

Static analysis result for SHA-256 763006b27f77f803…

MALICIOUS

PDF

92.3 KB Created: 2021-07-19 03:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 991f26cd756ad8ee9a9e0507740246bc SHA-1: 52f3f1283c450ac751fa0d1c5eb543eb160be4d4 SHA-256: 763006b27f77f8037fbf6e4be1bd10ff9849fff838cfb69bfea1dfbfc41af2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/62812955543.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf145be555---33587432400.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/vl6o5cseetlanapsdrhpc2pi23/51610051986.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/24203207297.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/21459726732.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f27077623---mupemexufejofiwireto.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78287bf23---30877441901.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qb1468f2vhiuhe04jbj8r4q1et/guruvaxopepunadisur.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/o7sq58imj61cg1be2pc9vs17m0/doxenakizisuzerarozuzekep.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/724877d7d004a2a61a26711ebbe3f98e/fadexamikumam.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xegurefojefebalibuxex.pdfIn PDF document text
    • https://orrizon.ru/images/file/35713352624.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dimpr3gn49o1bnc8omtes13unb/xukaf.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702ce4c5043---rogojogax.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/nakajobufaderamisuro.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/tetoxewipaki.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/90568799330.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021773500.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334cd062cf---20389749393.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/mafabenunulapijafuga.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad2532b6---tomimozilirolaratujebutaw.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dfc70f19402e01a79d74293ab13c2afd/rekifuberu.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/15607005875.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f169d70f00d---rilojebuguzetezisufixudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=snake+with+cat+headPDF 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_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 17456 bytes
SHA-256: 3ef65a58cce59cf395ebd246646c79e8f7af767a00fabdb88d6919a0ff4e9f3c
font_01_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 10284 bytes
SHA-256: 0f9fae345c762cade604f68626bc531a90c3ddc842e5ba2f039f5e71eba37670
font_02_sfnt_off00014bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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