Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba2145f2761197…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 15:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30e20b0d5eeb7a74ed8bfde77032f022 SHA-1: a79456d90f0f673b21ba9beba45296d33aaf5905 SHA-256: c4ba2145f27611977c7ececc1bff632a8b7beb8f00f13499ca0c19a1813a0369
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • 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://synerhu.ru/uplcv?utm_term=basic+economics+book+pdf PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43545dc07---gexirotobutopis.pdfIn PDF document text
    • https://ptogel1.com/contents/files/fisivemixaforanilufuxega.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/tikeviwiwipavekozezo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sofosudugotavevofanumen.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/zixiwarisiw.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wugerem.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xakufetejaloto.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/67110643111.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f60ee59f82a006cf0dd6f024db9c54ce/51107283428.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/fujudameg.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d60c6709f---jorodizuvi.pdfIn PDF document text
    • http://planetamama.ru/files/file/42095296704.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/siwilanovegasopuxi.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/15823357363.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/36352452712.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142df70d9bb2---39619819733.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53mv7682pcd6051malfimm43ej/muwamapoxagefivax.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/58198365983.pdfIn PDF document text
    • http://moretonassets.net/userfiles/2678982402.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/komeberudemotuwuf.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/26271157841.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/sopawagavik.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ad3cd659---kitokifufuj.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/63634318858.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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16012 bytes
SHA-256: 2a9d3f52e513506ce1c034140866f9a18956e6df8aa7013ba6e8c86c820ee498
font_02_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10824 bytes
SHA-256: 0bde557d2e87be22901948259eafbab0dc989e26e9b5d284b6778cc269bc8336

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