Malicious PDF — malware analysis report

Static analysis result for SHA-256 e659bf76e6f8bd75…

MALICIOUS

PDF

94.7 KB Created: 2021-06-12 13:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 86b8a68fb6dc205991d7c7af644a7814 SHA-1: 9a0faa892498dd0a6dc4e609334469987e4664ea SHA-256: e659bf76e6f8bd7511b0fc0eee44b872cf18a97efae40010204f217ed274c07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=xenoblade+chronicles+2+pouch+expansion PDF link annotation
    • http://gloria-eurex.com/ripufaxope.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4573dd83---46629853160.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/kikarosuwawakuk.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909cfa767e0---fuzexevakupux.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/moguwowepafedebezasi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fbb62842---10452652720.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/55ff0ed57b70d8905c99908e62e5f994/34650549962.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074081945a02---30369916655.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tazipifipejopuvoboxet.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/bipirobudifenenurun.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cde9d795d08e420389564012d97a1ea2/50176650214.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/58mtf06odeqekropbftrqaosm4/guloxovovopuzu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856b5de9f8---namexujufo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160865c59f1377---16775500316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 5476 bytes
SHA-256: dbc734769b21b7b72a5cdaf41ee8b05ed5291faa8615ea672f4fdbfa11d15644
font_01_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 10944 bytes
SHA-256: 5e9846ca73039ce8441287ff2c997a032232481f7538f681a09edf01ee502c37
font_03_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0