Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff246d922d90ded…

MALICIOUS

PDF

76.1 KB Created: 2021-06-12 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 82a8b9c85f0fc00e684d6f9a3cd54bdb SHA-1: 22f6a146b95a4865be50c57cbce2b77be95d5e9e SHA-256: 9ff246d922d90dede4ce9e157730af5b9a9da7f71ee1a7aeb0404edad020170c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, possibly indicating its origin or a lure. No scripts were extracted from this sample.

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://pistant.ru/uplcv?utm_term=i+am+malala+young+readers+edition+pdf PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dbceed46---79393328684.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/11mfglpho91detp1b08dh05ui5/99811852177.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e7700b07acb608f9a1e77cda561e0065/33452025629.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160869918476c0---38870405501.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a306a9912---puluwubogezifuxuxu.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tugoxudofuzupiwojisufaret.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfe88f8da---53418073036.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4t48lmfkenoe8fpd9ni3p13du8/32644441278.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae4e83879---27081436160.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jebekobiruzadimalirox.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56249604522.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dixajimerewagebebekeva.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/ridiz.pdfIn PDF document text
    • https://energooptima.hu/upload/File/74176640497.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/89326046486.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/58218751714.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5400 bytes
SHA-256: edebacaf0b56531beadf1f84e45335dfba625c7f20ede7effee89be6d69f8b62
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10968 bytes
SHA-256: 662c1a702fdbee3f7b48e2610b3bffa3f64f2fcdb812fd0ef12a924bd500bcf8