Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6a32e305df27c5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 01:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9624ea8029c1212b3e53b56cee98f050 SHA-1: f8c8d9e646daa6d95f6c112312d67ffc5738e6d6 SHA-256: 1f6a32e305df27c5c5d23e24abb594e3acac52923a5dcd590cd4b232b61696a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://garglob.ru/uplcv?utm_term=multiplayer+wifi+games+apk PDF link annotation
    • https://nilsahost.com/calisma2/files/uploads/wonosedujej.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6o41kv9g3vqlfj48aksj0k6ea7/mumowavikizedipi.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/sakaxev.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fadazipivuwoboxasul.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/duboloz.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23401737671.pdfIn PDF document text
    • https://poker-fire.de/file/19855692847.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/28313487652.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/47741248370.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/gofabi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9l2nn1dkkrtq74nbv8off0f790/dufafe.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109041657298909.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/fupirenapemebenunepofa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/senoliziluvixuzozadaja.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/xutifa.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/bovidiwefavomigibajapepu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9rpoqnsp59p5551vbocdrs1h83/wobewixo.pdfIn PDF document text
    • http://lejonhund.com/upload/64805429318.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2ea58fb7f45dd7871cd1c2ab4126dc58/zibed.pdfIn PDF document text
    • http://babamoleskine.com/files/file/daburaguj.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/68971776655.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9af59fa3---32784724511.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/49526944152.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/45597576087.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 17436 bytes
SHA-256: 4b350cef570532361a752144793d024109424b4de4ee717e4ab2b23e2c8ad955
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 10864 bytes
SHA-256: c016bfe8b9ed6762a4193ee2a92f281db47f4576df3fb25bf8df0246dd61363c
font_02_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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