Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68364848719213c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83595cdd852a5c041667cc8900053a91 SHA-1: 5666e39584a5f599aa6eebb4395d8c608fb77eed SHA-256: f68364848719213c79c7254872d82ea8518cb57fb32163abb997ff695731d00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'utm_term' parameter in one URL indicates a lure for 'free download', aligning with phishing tactics.

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://krisoc.ru/uplcv?utm_term=start+small+finish+big+pdf+free+download PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161423498cd4a8---lebazukokekovod.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/14587348675.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0epclv00prpalgp7bd961717so/vubokupuvejosokupesope.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/mevigujavale.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/jukexi.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/pivagivuw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d94b34eb7c6ea30fbb8c63a71679f167/lojowimavideribogegiwit.pdfIn PDF document text
    • http://baove24h.org/upload/files/17471773991.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57695346200.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/galetokagizagop.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/mulasigibusaru.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vuzulanaj.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fejijiz.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/87108082356.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b888b4f4f4f68d0d950746913cf5504f/82009787798.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/19171016313.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/kixekubejobiwisowem.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/47823504058.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/63577674669.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sapebo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/bavetaxudugojogoxadu.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/12349726216.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/89214410730.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/66957282074.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_off0000b618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 11248 bytes
SHA-256: 5d15bc5d60599463c777123e7997c751e9f623e86dcedd0a1640fa1e16f7d806
font_02_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 18216 bytes
SHA-256: 20f05e72cd6e8275fbcba21dcfd708ea30f8bc5c3f26b662f7fd46f068f28fd5

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