Malicious PDF — malware analysis report

Static analysis result for SHA-256 0540e17351ddf9b6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 12:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66cee6efc1b4bad7035db0d58be72c07 SHA-1: 9331d19c30e638ea799e1a6f7f816409f75e5778 SHA-256: 0540e17351ddf9b68f5ff8668372f07cc11a24c438bde7a72c2dadb7769fc44e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fb26b87---lumarotojipetafevanada.pdf In PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109110108017348.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/8364992700.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/barukifizubafe.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/92602084239.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/71136327829.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93200083582.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef400af0c5---87496503812.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/ritameje.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/sibefojemobijefet.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/84189906910.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/jolatagirefojememu.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/92669669354.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/20971648891.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed6fb74091da1958b4a9f8952d5d7aaa/55449805157.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910083140.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109030254403017.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/kivewez.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/39103140175.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kebupemesu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/87651441696.pdfIn PDF document text
    • http://4yoga.by/pics/files/budarilorofewovuwot.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/95703195514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+go+price+in+bangladesh+2021PDF 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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 18368 bytes
SHA-256: 9372e9d9369296c4d95d6cf7976c09957d39475d5a5ad57f57b6baedb3692e8b
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 11340 bytes
SHA-256: f0548ff51908f888cff557359f7c1c6d8d2e98d4a1858630a88bbe1632241802
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1