Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c5ca2390c9f887…

MALICIOUS

PDF

93.5 KB Created: 2021-07-19 20:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80f2d260ab342341d3dce0212b72aa09 SHA-1: 11557278a100570b21ed2a7299003a1382829e5c SHA-256: 71c5ca2390c9f8876915c92b9badeb88099b90e54dfd353a9d253472dea39ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mvservice.it/file/wepekugefoz.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bf9d94ec---87508905558.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608310e920e38---97637212369.pdf
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/18374532214.pdf
    • http://jpind.pl/userfiles/file/puvibiritevatinu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rjtghml9m3gpevcd052r00dv7f/59106258711.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a6610bb3fc3---salomuwadomo.pdf
    • http://aimic.com/userfiles/file/99690155798.pdf
    • https://pharma-tools.eu/galeria/file/tamijowi.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8428980d78---31585618291.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/dd5a1ce0a4380ead123011d357643dec/73253701430.pdf
    • http://dribblebar.pl/userfiles/file/zudavowulakigepexebotimo.pdf
    • https://stillwaiting.org/userfiles/file/20209018910.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/260a5aa0396ccccfe542c4131faa8adf/5846401446.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c448ed1322004a302e47c1fe99dc568f/92372909978.pdf
    • https://hoavily.com/uploads/files/bejitibugaxifoxu.pdf
    • http://axwelindia.com/uploads/zosowekoxesabupebogu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607295c9a2626---tipafibowor.pdf
    • http://akssert.com/userfiles/files/gumazimisevigibosewaze.pdf
    • http://planbmedia.hu/files/jonolerabizibijibimesa.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7570469c6886da8ffb32c79ae3fb52ef/55382428546.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a905f919ade---zumazuvebonupawozenif.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/18478bc8cb09dacad044bd17a7837c43/11782810755.pdf
    • https://ceccargiurgiu.ro/userfiles/file/93582271066.pdf
    • http://webinside.pl/userfiles/file/gowowizalifapasorotaxir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=car+symbol+with+wings
    • 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_off00010958.bin
c268fd8fc3d43627df34cadb57d067350a8632db1b4709af13d11fcc7c6d4cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 18028 bytes
font_01_sfnt_off00013801.bin
04428fa5cf402d73e1c8a84254c03501531938f0e3944b0db345f64785ce9097
pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 10792 bytes
font_02_sfnt_off000150c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 16792 bytes