Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b26d519fcc90f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 03:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b17994a0f9ea3167fd77f2b7aa266ac SHA-1: 630995442e34e15292a2933bb0e3d20d46042f18 SHA-256: 078b26d519fcc90fd72f4a21151b859fc2447016bf5f252546a4f45bec733908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=uk+cabinet+manual+pdf PDF link annotation
    • https://psg66.ru/admin/ckfinder/userfiles/files/30216318659.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/getuzegilukub.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/gevulunofizemoxanu.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/logike.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/10520275713.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/dujezagujopupijifigoz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c0b8dc17---nijufesapufojaf.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb33ab3b49---molitimemun.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/88368860306.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088834f5a75e---xuxafeduvawijezaxafit.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/lepikolejexofutu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lt8qqhbn3b10sq9a7fme6iq286/26781372172.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xerawixinilebabobone.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/884077071a69c00e9493b5f369869480/pobigad.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/tikebigadi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c877a2cf20b---jitobidatabi.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/gonenozufagipavam.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8f3u5paooskimqf5pr0kma55ic/zedipadevik.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/kaxumososed.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/58802909309.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4540ba4cce---36800093928.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/15117909703.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09a903aae---86835285207.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_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 10732 bytes
SHA-256: 5ac5c16528d5a436e0e24778e6c9bc671c75c5d994072f662639a003ba56c7eb
font_01_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16860 bytes
SHA-256: c6e0ae75066afa422e9b53db1002c6d8b65d77f5f923bfe9624cdbabfc7f1cde
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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