Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a83b25737959a54…

MALICIOUS

PDF

101.7 KB Created: 2021-06-17 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6e1b149335e31b7f95d59eb15ef8d490 SHA-1: eb47960be48ebde5fa0d4fa6439da03951e9772c SHA-256: 9a83b25737959a5491f6ad853ff6aa2d7a9d4edb9abfbaac3ec85dc6fb068351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing attempt. The embedded URLs likely lead to further malicious content or phishing pages, aiming to trick users into divulging sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=sentences+for+past+continuous+tense PDF link annotation
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f9af434---wejavafurarug.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6620392df78c493588a0676cb9ce4fcb/tofufilowugiwekafuf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/bugulaxotopo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c3c44fe7---rudukowaj.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/369695f6c46978606f7a845b450ccd93/42803618230.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5d8c04567f0192a66d348c8669ce11e8/xukupezimabedos.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/salasuloxibotelorijoxade.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0c2749a6da934860433820a2e95d6acc/tupesapexatogenowifis.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7c5e5497---niwefotexaborezisovitile.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/82150746718.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebae9b94d---gobepimolobus.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/14f110b003f1bf10d79a140018c233cc/80216674491.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a1ec5ea66e38dbba744ca82c54defe90/59623297572.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609395aec74db---37692555229.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609736346498c---64861869248.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e5dd00bb---34554042047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00013b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4D 5080 bytes
SHA-256: 24bdf30df699e8aa81e49880a3a73a876977595b2215ab89c79f014e463f2bc9
font_01_sfnt_off00014ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA5 11436 bytes
SHA-256: afff0ad8e04b8768fa5e6e144c21b5374fd808c5164914b23df843b9cf6d9540
font_02_sfnt_off00017364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17364 16544 bytes
SHA-256: 49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5

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