Malicious PDF — malware analysis report

Static analysis result for SHA-256 a694133c472bd33b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 20:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d89c97dcccf0792b2d1c08971c79cb37 SHA-1: 61375837053ec1fedcae2552dd023e527f2d61a5 SHA-256: a694133c472bd33b3ad56a390ecb5a29d24bf63e8e3cbb3add555544c6eb7780
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites hosted on compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/fanilesez.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dfu2f9cjl7pbga9ud7ilakbjdp/87596897312.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tokubogimitapoxi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/22358269569.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85047421828.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/dunufuxowafusovim.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wefaxugulovejideza.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210618_151354.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c518fe332a---votusonugatik.pdfIn PDF document text
    • https://avflash.nl/upload/files/buvanegozuz.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gebuxenulij.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/4735157659.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848edb4a72f---jagirikafepenemik.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/tifebebeno.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • http://capital96.com/userfiles/file/81499279397.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/50a0115afe1c387d8edcc778ad631b4a/xoborumuxifetikobawuxa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5pl0cbslpll78jlblgabfutbu1/32863973332.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82444395025.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/binul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clasificacion+de+carnes+rojas+pdfPDF 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_off0000bbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 10676 bytes
SHA-256: 5d6647d9e0fe2d252ae1233834ce14d446e3ca0ead1feb11aa461002ec390365
font_02_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 17404 bytes
SHA-256: 5074acf8679448a7aaa24fa0e61c1b5614b5ac16b02e06b138af035f4a45756b