Malicious PDF — malware analysis report

Static analysis result for SHA-256 8206e992e51b085e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 07:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c9e22fe68d092a731d55bbb6ab2caf1 SHA-1: a3ff0053774944396a063a5a9ccb88e337c14950 SHA-256: 8206e992e51b085eef4b1c0221909a6551173f25516fbd7df234d643e8faf25a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are common for initial access via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qe1q5qflrb16ludh4pl2jrgor7/teweg.pdf In PDF document text
    • http://abnicum.com/files/file/duropiromavofalisopized.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/radatof.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/62641111295.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/49343550614.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f2c99698---21310612848.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d4638b07a5288765b3bb7d05f5558348/vevezelelazifazo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mf4nooqdp0946de8c2fek9u6hi/fasuzisilasuru.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/35907286157.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zatenebame.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j5t9gvmqutdi3rams3b5a2ql50/15242567475.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cim3l19alsblthvmmp1a708h4a/sodibutafini.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/46845205481.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/gakuviruvepesiwok.pdfIn PDF document text
    • http://glttek.com/userfiles/file/mabugonikuvuwowu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xodubef.pdfIn PDF document text
    • http://chineseclothingonline.net/File/68142362197.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b58fa9cb5c---30931155450.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/43248982675.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/bujekenezufopovo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vaoj5tg63k8ppspda1r89k3d60/vuxudaluxu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5651b12670---7215174071.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lulubijuvunan.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc17b5df67---17245077761.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/33323866202.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30gtq6mste3ff310v4o0bt7p84/veluvuboxerow.pdfIn PDF document text
    • http://allycatering.com/userfiles/42476942040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=back+country+sportsPDF link annotation
    • 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_off0000bd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16140 bytes
SHA-256: 584b20b1cfb60c9af2487e2a3921efce9fa57f3fd713fedb8da631fe19ab594a
font_02_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 10456 bytes
SHA-256: c833f54d95731a6e41df72ca2c5558740d01d197f417364b490097d92ac6de15