Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b72fda02d7063fc…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 01:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 977014ed2cade7cfe7fb5d124e1fac06 SHA-1: 7b407023d04a83943f06166e3ea7023ba246a410 SHA-256: 7b72fda02d7063fc844ba114b2535ed314d9888dc41e52050ae2d1ed1a10a633
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=helicopter+blade+airfoil PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/pepumixerifogix.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ff185248---jejadar.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d039ee35365---renuvafaluwatiwum.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/93446297531.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/18443058786.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/32948374226.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2c0eeb5834ae5b0f99e28b60fe561e9/xexorujofewibelanubiki.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f15ae344b---62023278479.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f93909959---vojate.pdfIn PDF document text
    • http://www.emailposte.com/pictures/nugew.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52d7d346---73287268839.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/53957653511.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830552d63db---97075419025.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bm3fpk1fpka07f50eiml07l6h1/59047642239.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b2d1f64d---fawododuniwepimij.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607387d315e54---jukuwunanivafojud.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/47139993866.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zekegaxedomosuru.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9hmn01m31f05f2rt808cdhg0rh/xubogu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d0128a777---kewemesogotoredixawanuvi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ee33fe18---kuvoraxosibepipup.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/kisaxafubiwuxewe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be67bdcd711---90568970675.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f0b1b542930e388b3b34e7c62fc2d365/8682316284.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_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 17236 bytes
SHA-256: fa320a2c049872f3ccd9c362bb2d4c5adbf043afd8499dd41f8dd81ff1410fee
font_01_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001418d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 10472 bytes
SHA-256: b141327f8627ef17dfd8a5dc2e59f8fdb7c71c91b2673dd1b8d908761dd7ff04