Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda8e8b709be6ab…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cba46fb9081f56a20e517bdc8ba40798 SHA-1: fbda188d193dda72c09d68ab94af3d03cfae04c1 SHA-256: 3bda8e8b709be6ab08bbb638ddb1f1077c6c820eaccbfd97fb312a2740c0362c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.jindatunnel.com/up_files/file/negano.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b66c6724---dawezuponixag.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6aec71fd58547190c72a1cce0dca3ad9/86506712840.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/mutasivipavosuwamodojuwu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78b81acf3---nusevegux.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e4869e5---8014551287.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39660803599.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bezewuxofuputudaw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/555d6df50a15e53b792ca4c682e7d602/zapiridudib.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xekoxegenutazeratovomi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9936b8b64---66427949534.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdeae30d6---ziloratejip.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8688d0058---52030635544.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0ki65r1nb1idronuq17urko9j0/xepimubikodawibaseginewa.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/mosivuvurabawe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0dq9pmj7mup2966itpdn8socpr/18819498663.pdfIn PDF document text
    • http://sciattella.net/images/file/kasofudasawapog.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/7377620777.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607faad80a54f---26836292541.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f750c1ad---37698616389.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c372353d97---14409840127.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99020405346.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a31a9959a7f89ed425e7a962a9a25286/58177893013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+copy+link+in+gmailPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 10600 bytes
SHA-256: cdf3c72e72af34e4337dafc11480404d901219c3121b49982f8a143b8d373acb
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 1684 bytes
SHA-256: 57a73d877970e419005db3c38d676d43bf95a4071fcadb27eca2cd578d21aea2
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 18768 bytes
SHA-256: 2a86376ac42dff0bcc300fcc029ddc70112e049f8af21e3d4a1cc5c393af9737
font_03_sfnt_off00013b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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