Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ae4bb17c59296e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a58253250e7584e1277a261332aaae68 SHA-1: ae8b46f7c031d4bf7465cfa13931799358377e60 SHA-256: 69ae4bb17c59296e27026649eebd93963a0afff4bb8efab14b4e8c5d80002e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a link farm on disposable hosting and that some links point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://minhphucvietnam.com/uploads/userfiles/file/49004372967.pdf In PDF document text
    • https://mashura.co/userfiles/files/52404637823.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/87995585300.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/fusodunip.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xegemiwibuzosojedojiga.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_AC8A1C3B059A81E9.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/joralerimopozuwanubibi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/23e52a478432a0f8d33cefa79e01016d/dipogexeji.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/febimepewudiloxinibupani.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/gajibuguxusiladupurixipe.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/78642923787.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sbf0ndbp42398o0i2h604f4mhj/94011431888.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jagezafeselewatife.pdfIn PDF document text
    • https://biocoils.com/img/file/47005752812.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427db01c3ca---51702933408.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/25964933972.pdfIn PDF document text
    • http://poliinc.com/upload/files/21019045155.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021931223168673.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/69453006339.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/93681540894.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/25368969558.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15672568665.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/gojonojuwesukojoromiwute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=3d+aim+trainer+browserPDF 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 17508 bytes
SHA-256: e9f6563029dc83d2980a7e54f997421e197440f0be147a924964109c396402c3
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 10664 bytes
SHA-256: 1951fcbe0fb215e8cbf2f0d3d375273cbc82931b39b629051535a11262fdb1d5
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1