Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76f9bf9e18a39b3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 22:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91a867565113bd1d4fcb7c7f6cac4f8c SHA-1: a3ab173a1889e95382bb86acad7a7175e28762d8 SHA-256: c76f9bf9e18a39b3244088d747f3bcc0a519b1811b3bece553069e983ed3a39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be phishing, leveraging a network of links to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=pdfescape+portable+download PDF link annotation
    • https://seeandhearbetter.ie/img/shop//contents/39329560955.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/s2bfm5l9klbdnfqa8d77lje209/gobumawuduzotaj.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xirokepifi.pdfIn PDF document text
    • http://gibisch.biz/files/files/19491159588.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/43174111875.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22ecdabbf---66671967846.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/natarasuxe.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/77429477300.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/34162479b06a7bf875253f1e9e381b1c/puzezegiv.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a214266c35d99d29f7e3c13171685199/biragefikamofugajumamaj.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/51331508730.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/doxezowofoxabuperux.pdfIn PDF document text
    • https://go2germany.ru/files/file/98650966061.pdfIn PDF document text
    • https://virker-ikke.dk/files/66248868094.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160844df3e7850---gebigi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/suboliravesuzakumu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wirebalivefuzuxopufurozil.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/94188801699.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b98381f6e752f420425cc4f37d734533/66867328526.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7hjs2ih8h3pnjd1q81f5ngn162/badifokaberevukewekopu.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/82299736817.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/o39rn9d8icmv9s61788ti845go/risumijusazutak.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed4fp1hqespjsc74c91idk95rj/22832545889.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/eovha30ashu59ebs7nfgvln072/61416356261.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xarodujenoxulodezixedig.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 17620 bytes
SHA-256: 2994202eb039e03f8f85286ce2703b93bf50c34d0670798da1bc0ad05f94de56
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 10748 bytes
SHA-256: 7f5575c11f4c8ee08eaf8e61abdfce3be5ba3a44166bd0c2306c71e1d769207d

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