Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d85a836d40a8676…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 20:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58301371fdc72c5059d3037ac6c16aea SHA-1: 6226403a0fd4971be16cf4392a6615025a1a3c8b SHA-256: 4d85a836d40a8676f5a340c83edc06a5c264b253e400f29d9ef276440e1bf6f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malware. Heuristics indicate a high likelihood of malicious content, and ClamAV detection confirms this. The presence of multiple PDF link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470b891648a---minupajikarorababo.pdf In PDF document text
    • http://leeandrewdavison.com/download/58067829715.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/6512024235.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/95818616594.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/xobedegu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16092333355.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fe9adb47fd6daca83595640a0b4a006e/55494778098.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/7954117317.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/17510791140.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/24928216154.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/xamisikezi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d65e76de7---xonavoz.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/sunulitusamaligubexol.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614059bc6d9b2---21200038230.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/72895133625.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/46536984201.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/wejejibilowutewe.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/14741661282.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/65879108771.pdfIn PDF document text
    • https://datawire.gr/files/files/49110938554.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/pekum.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/sexudi.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/54350028042.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/kivegezumiguwotigixinetaj.pdfIn PDF document text
    • http://grandfiltr.com/files/file/77388348873.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/69957022443.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/vepegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=procreate+free+download+for+androidPDF 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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17992 bytes
SHA-256: e8e2af54b282fe856e2f6324db54a6834cbf702ba8e6b8e4f417cf7218b1b74e
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 10388 bytes
SHA-256: 92ed7d0d135825ea03078d76fd45f03b70f7fa6143d5ec50cbd48f6a362e58ec

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