Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c5f503311b1d84…

MALICIOUS

PDF

103.4 KB Created: 2021-09-01 00:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07d57ebb70a8422e41cf6acfafefd1a6 SHA-1: d9df134857b80d3a00a3e2d18a625d5648c86204 SHA-256: c9c5f503311b1d84f1b800b39236d37205ffceaac88a57516c550a497629ee3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=lil+wayne+most+famous+song PDF link annotation
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6ccf3c65---40797019301.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vigabuzulirazurezorelis.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/monuxerovirinof.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/4hhr47qr0dg13rru27rrc4t32r/74720387875.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ed263249---14551271267.pdfIn PDF document text
    • http://nenorm.com/files/files/tozokuxamizavu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72629a8db---87633825968.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30da23b2df---bizozazumun.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/06e0f5a1e16267e4a74a93c2a8face8a/55991352834.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/45315409412.pdfIn PDF document text
    • http://waypl.pl/upload/File/vepusarobixetafisigimori.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161140d108ff00---vizawavifizujukoxa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-17/20210817180215907685.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/keziwanaxejonata.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c348bd6fab---91438312942.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/845bd0dc60d6aa2b93411e18ba0a1140/40128618776.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612899c12b0d1.pdfIn PDF document text
    • http://kaies.cn/upfiles/210603164002567171y36e72.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a1cdc539---woladelolebuwagupesoxufip.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93452948e9---37016615936.pdfIn PDF document text
    • http://mcutech.net/files/bogetul.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/vusezotaxotuk.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/78293557685.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/54427486035.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dc2e39f99d0ff78c6db058d454f05a08/jidubopum.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_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 19676 bytes
SHA-256: 100a1f78728bf1d7ec4193c72566c5a3cf97daf8437a83cbc26d953be5dc0106
font_01_sfnt_off00015f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F66 10712 bytes
SHA-256: 3fbd374c5da2f637e301759bf5092130fb4dd027c11d044fd99db31cf85f5997
font_02_sfnt_off00017815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1