Malicious PDF — malware analysis report

Static analysis result for SHA-256 4465a9f8da729c41…

MALICIOUS

PDF

96.1 KB Created: 2021-08-11 08:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00cf1e6b6e1c02738adf492ad37fa81b SHA-1: 89826e5d8aa485b5aa97bb6f767a51f9de2b2b90 SHA-256: 4465a9f8da729c413674d9c54213622767c632fe4f29720b8e26b55a5681fc13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure of downloading a payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=rrb+allahabad+ntpc+admit+card+2021 PDF link annotation
    • https://muzeumkonstancina.pl/attachments/file/gukavuzu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc0d680dc---62439627615.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928642b64a7---losisiwubosibonaguwijosa.pdfIn PDF document text
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/zonidowali.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/92641795352.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mqfslvufo9grdd0q4llmegrd8m/putinuvibal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e32952bb1---fimugimorujugoremokika.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bcec5253f---74420694163.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/2524565716.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f94a05c4b6dd7f7694f524894265fb1a/vumajugomuveb.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6e4e6a82c87f3eb044f13d528c14cf4b/44849876803.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5eb2dcd2784d6cff6bb582e0020bc6a9/45255565901.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vupaxuvos.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a48250204d7---32154412337.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ed71128c---60530566179.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/12ef5e14505e2843faa5f16a0c99530d/wezavagapekewabewu.pdfIn PDF document text
    • https://activepymes.com/pub/file/xeruraga.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/xumuwelevorowozex.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/zezis.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0822272fe---50965489155.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca49feb2eb05f9349b919e9f13cc189c/zatufobujakeninubibuwaga.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/81706064274.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/pefatawefege.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/dapenozavefakopawajajetar.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_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 17080 bytes
SHA-256: 536ae35281d9c741087bda17fd30015cccd56750c50be80ee4e7ac1d078a15cb
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off0001410e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15925 10840 bytes
SHA-256: 98e97aea38f12b2d31ff2d9e2f69c6f6b8de17e3031a020fd8523db9958367e8

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