Malicious PDF — malware analysis report

Static analysis result for SHA-256 af758c55d1d0521b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 17:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2cf0534feebadf6e5aa3c31c0a54f8b SHA-1: cd40b4ce52345af08d5d9c7c0692bcb923b17c4b SHA-256: af758c55d1d0521b39d7252f60f728c7ab91431bc5fc71b605d92a6cac88087a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to PDF files on various domains, indicating a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior and suggest the hosting sites may be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kiptep.ru/file/sorekuroxilurefevof.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/3278688826.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130edaea3ef4---93877705011.pdfIn PDF document text
    • https://labelmarket.pl/data/file/danitumedukagalotidatepit.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/6951215073.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/37937167292.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/47047253246.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_185019.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/90968724300.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/supulekikutokebozokir.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/kidupuwemavebi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a818fdda46---lebexalevegusuginane.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5158b7953---zefadakedo.pdfIn PDF document text
    • http://patroha.hu/file/vivapusenitamizenuwuti.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143217a845a8---83248763167.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nagitifi.pdfIn PDF document text
    • http://spharma.ua/files/file/gubafakotavuxano.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631878402_58937734d4.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9ca6536---jotepivuf.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/82974840745.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/wanodevefipufas.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubogezapos.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210922191913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dual+space+apk+litePDF link annotation
    • 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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 18916 bytes
SHA-256: fbde9f8c2853142339c63687726986c2c5be0965c2f4f4695a8e2b3d5558db43
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10236 bytes
SHA-256: c0310bf7e34bc5a03774e0ce017d2ead3313f3d7347cf52eb438d34953757780
font_02_sfnt_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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