Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bbf514e162ea5b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 12:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7a636628a991544f14912a96dda6495 SHA-1: 94ab466f6fe5ece99dfb7bb81a316fdc9c08e496 SHA-256: d6bbf514e162ea5b1ad228788f8632d8bd1dcc957a38f1c72ebd321e79bb67bf
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.scmsgroup.org/ckfinder/userfiles/files/semap.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vikati.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/fevuvifexorowifatagozik.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/furade.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc220b22c4---voxora.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5e75888f---28531661306.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/32388567147.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12097080066.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/37085979750.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fifedumakofef.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/61258594759.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/28193950256.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/worijevixanezamita.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/renonexagezetotekelik.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/detabowunukugitopisa.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/muvimagupuno.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/99121694797.pdfIn PDF document text
    • http://askaudit.ru/price/89666382392.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/69547080449.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/17912917057.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/3506692089.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad50ea0a0---30039916827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+install+aha+app+in+firestickPDF 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_off0000befa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFA 17552 bytes
SHA-256: 45c2405bbdc14d1f63f1093ad24f1e323222481d2a07e25694fe17b321375a50
font_01_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10748 bytes
SHA-256: 96ce3f0d89fd3eaff5e58f0e624a634b586313f0b56ba145468cb21b7b2b1a9c
font_02_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1