Malicious PDF — malware analysis report

Static analysis result for SHA-256 57df39d67c22b17d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 22:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71a54a398c0f5207195caf47348bc0bb SHA-1: e3fb2b475b7f90008f281b89121a488d0ac0a5b2 SHA-256: 57df39d67c22b17d4d110188bf3195be329ba7c6d08bb83723a2986ace79929a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=notes+on+physical+education+class+12 PDF link annotation
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15c5d7947---dubidaninitubame.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/14434132320.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d216eba84ec368ffccb4d531cefcaeb/jarulexewiwafalokokawu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zijexisaziji.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/14315724157.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4348a31ab705f395d48aec597ebc2b82/duwonamuxer.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/joledisaduma.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f71967e18---mefifojurokanuj.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/parab.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/72131686174.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/68923404287.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092626031262---kelasuje.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jofikedutavebu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2589b4d759f1f7f183e615a2a33a02b8/dabarevefinizinujeketu.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/52615636497.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6948675445---jozumunetajepedug.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/ruguginujiwezapixel.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/46314126571.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2016319d0a078ec72761cbcc5387ea35/kibowenuxivegaru.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/15796355133.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5gjdqe3d5bvi0la0ko44o0vfsh/mudinuv.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/26307495571.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_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10872 bytes
SHA-256: 380d5fdaddc267f47f6aeae14244971380d3fc26d40270d448783cf69a05fd5d
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 17292 bytes
SHA-256: fbb3231c39f3bbab339b348ea4cd63aec8b6c4b9dc76a999363c1d442cc791a4