Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26c6623bfb76ea6…

MALICIOUS

PDF

97.3 KB Created: 2021-07-31 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58eba58d39f97974e531ac0845ed6a9a SHA-1: 9ddbb1e00138b13258936aae3184233c6c75d927 SHA-256: b26c6623bfb76ea66dfa54ff2ba643355035c676e78d1a47507fadb8388133ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://cructi.ru/uplcv?utm_term=edius+6+crack+only PDF link annotation
    • http://mtecommerce.it/public/news/file/98366586606.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/wusulosawafadexomo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7720e4e06---wiranalobimigikutive.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c1e65fbfe---butigerizuragixanaku.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/70656599653.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/vuwugawuwu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57052958007.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713aacebe70---muforovasene.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23c194de4---85370131183.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8cb9cc0055d91cd38b8bf222de6bb54b/totelivovatifefojovi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hsfak2ovmrpkqrj8tre1o1o8nn/ranilixibexonetefa.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/8867730764.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sifume.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nexusokomawogegu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xiginukirobize.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/20760428746.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9257109067.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/9fl7j0koi233oafnpiod2ijc2a/bevenis.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pgvk6dh9a6l1vo47bdsrlt15d1/57963015696.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe45120e5---69341058987.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/duzexesosoguvuvedisesa.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wodeluwapunivepo.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/65537905733.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7ca03e9e7---80047890167.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/57d257ac4f38d459eb211e13c70d9cd9/22900046707.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_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 18516 bytes
SHA-256: 020f62c0c667c42b646a97dc7e207c748167bdb3bf616c4abf2bc4186b9d1bf4
font_01_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C99 10592 bytes
SHA-256: a4bbfd83c28843e989b6065e3941a78fc81f7fb8a1287c0d3600fb245f66255a