Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecd66d9fe2dc823…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 03:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 666edfff5a2e086473e03e53ecac4206 SHA-1: 71aaeb68f32f0ccb6daeaa74a2158dc3d8d7a266 SHA-256: 4ecd66d9fe2dc8237a08256f2504da023bd5b51f09dc1552e4c1f833b8007168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content. The presence of external URIs and compromised CMS upload links indicates the file's primary function is to redirect users to potentially harmful sites.

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=60+inches+in+cm
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d63b367c7---diruxag.pdf
    • http://fitviewer.biz/files/file/roxubirikibugapowiparata.pdf
    • http://gallery4walls.com/upload/editer/file/zetafutobogokokefemotiwit.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/60397969321.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144e1bf7f0---51232246570.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/sozajokivenamimeditixakeb.pdf
    • http://studiogiamberardino.it/userfiles/files/noxamugofewuvelipoza.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/696d8d6b07ed7d5d3999a8cc65777221/17543682339.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae039bead2---91943871333.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceef1fa22d8---84259020053.pdf
    • http://skincarebylaura.com/clients/862251/File/pexagoxarafonezatezofefel.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/ruxexubamadefezusodag.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bed8e25fd---kigut.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/91911057070.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/v9augfr03mttb5fgk3j551r1u0/77283328250.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081729719f1b---93945625916.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/508rehieje3autj1jr9nptg53e/91641675547.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/buwukinugirejis.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0250cd6592---30753339825.pdf
    • https://wfca-czech.cz/temp/userfiles/files/72270891600.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/mukejubajerexane.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1ac7fd8e---30016816968.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xovamo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
font_01_sfnt_off0000f7fa.bin
9ebeb180a84dd7df2c7be80394b93439cbdb802e8ad917da56e04729e043bc12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 19464 bytes
font_02_sfnt_off0001299a.bin
0ebd279824275745ab7dd26659f8ad295daa2bbdc14afc4e7ba441f34fc88857
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 10160 bytes