Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bddaca348afdd6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 02:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: baff3786686721154501a4ed526c8e65 SHA-1: 62b9fc2e0d8f0b08bc97089669500eda65cd181b SHA-256: b3bddaca348afdd6f82810c8ce6b1bf940f74d5388a6a7b7c3bb1d974422d6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=manual+de+instrucciones+pava+electrica+philips PDF link annotation
    • https://locktactyuma.com/ckfinder/userfiles/files/27393332791.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca54b7478f---19481543950.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/daxuwatukuriga.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f1599a703---fuvewanogusagejumexo.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/7599fd6ff538e63d1dd7465a7a1bd2cd/18135122261.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eeaf0d14---vibigovinetopuxesekexow.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4025d7e34a---vobaripegax.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608482e9e4a7d---6425036550.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc2619dad6---fotuxeratesigawenewopuf.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609673e0cb15d---73615232381.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/86638768541.pdfIn PDF document text
    • https://yuktogel.com/contents//files/86235891218.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fe82b360---jexozesulajamotetewupo.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/66786364454.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/93331657085.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/974066249.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/96cd5ed7d0dd71ce1cd5daef4f398c30/31570894535.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/22242531326.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/s0fflh27adpsvc3u7d09pfcai4/nawemowijedun.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/37557665702.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f48e6d62be8---kunixujixikix.pdfIn PDF document text
    • http://www.grifin.sk/files/4151549311.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/95549944249.pdfIn 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://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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 17948 bytes
SHA-256: 02e873b5ba6b60a7bfa360c8a673c0500bb89036f342df75e0c22ca9f5b534e3
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10772 bytes
SHA-256: 37f63052aa648440130ab827438a326e127a01801a558bcd68b6d9558237ee7d
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1