Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4326e98df1b56d2…

MALICIOUS

PDF

74.9 KB Created: 2021-10-02 10:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0f045e67fa2e5d9a085460942db0f0e SHA-1: 57b17354bdbd41a94ac6b623460d442efa167ee5 SHA-256: a4326e98df1b56d2abba5cf55ca05c74faae9cdac4b5a29706b186781f53fcb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier returned a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. No scripts were extracted, but the presence of multiple external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=types+of+fire+extinguisher+ppt PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/36194308189.pdfIn PDF document text
    • https://wonkingchina.com/d/files/fetuvarawigovusuzelavug.pdfIn PDF document text
    • http://enewind.com/pliki/file/99273639439.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/pozugegodurixazopa.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xadajewukanejot.pdfIn PDF document text
    • http://asqcert.net/files/files/84544810977.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fb9f8fbd723db20c4cbe17a398e4baa6/wameko.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/zepubofaba.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/78cb192b063af4cefa1300a0bb42259b/wakosomumu.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/41995756660.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/terubuvaza.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/92495571475.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozuveniwakibuzeke.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd73a7d8f---fozasapomexefel.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/92081657549.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/nexitukavitexasaduko.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/givovejaxop.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/vizurivajik.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bekozesoduxobivurimo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/92f319b402094b34c6650d3a7137f2a5/31635895643.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/xabovizu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j593u8jgo2j46vujhpkp80om1p/35079219947.pdfIn PDF document text
    • https://proia.bg/userfiles/file/nitidakosanipalibipowurum.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/36941398314.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/bubovezijinivivafarofidax.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_off0000bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 10708 bytes
SHA-256: f2cadf6f16ac14d114f8fae53f698ec5440e795251404e44a4bc795d1653570a
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 18412 bytes
SHA-256: f18508ba901289cd015e638b1dca69a29a07abfa1dbbc950ea25a0662ca4e3fe

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