Malicious PDF — malware analysis report

Static analysis result for SHA-256 9548fd713b7a43d0…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 06:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56ba84298478486448324a3d1e914491 SHA-1: a751083eebe3a22f7b5ef54e3f352fdf55bb739c SHA-256: 9548fd713b7a43d01ac4cf88b00aa89f5fd7535be60b6d68b04b762e42a7932f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=dragon+quest+xi+s+characters PDF link annotation
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/n0qcil3aql697c3136gj3dr0h4/zemutulijigekufimiwofe.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/69933587472.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/40cfcedb283fbcc175ca550e5a5346fa/57068646352.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1j4esokddfpbtvisa6qa9dgrn8/53650130129.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/h26i2lnd9tcn18lud26tepftb2/20775423815.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/lipivigefogoretora.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2db0c710---45510730744.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d02b4272364---17579861039.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e8f0ca314e225eb08f51dba4bd55c122/pewurofel.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/54c6744304eb7f2e537db3de0d4eae12/kepulisafekalijelira.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/36898525897.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5ea33acfcea083b8bad7fe7f29c77842/66433368556.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b30b215d0---pimoda.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ee376bebaa88c87fc5809a641179462e/6998560057.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/zotojowepukiwexamoj.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ffb373f50ffc11e67d10b23b2aefd1e6/68832083560.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/durobuloku.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/65768966991.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zalemixutexojitoj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/24302410384.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/20ttai1ub3esea3vd36j0vahvj/rodedunigi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608521a109c57---xewarafugetetix.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/kesala.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/vusodejosirarobulixamolo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 17560 bytes
SHA-256: 66a75b82b5e06c831ea0e989480d0418f8cf525e62e0b901b2be316ec7bf3fd5
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 1828 bytes
SHA-256: a4032c0d4d2117a07ebfaa5943239292b6370deffb3fe2c470414b44ae655bcb
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14041 10812 bytes
SHA-256: 1cbe3dfdfd2d67a95a28469b45594ffc7f957eef2be0468e67dfadc97078a0e2

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