Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ef4aae638f0263…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65e809fd9badcbd40c8a9edb55aa8243 SHA-1: c677b44c7a94bea68ac52ff64eb14ae4a0fd75a5 SHA-256: 56ef4aae638f026366e7a2518ab8be6b3190d1e60efa07f51b167c9e64d1478c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=media+law+and+ethics+book+pdf PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eebfe9c2dbd2caeb6148621a3664c87c/9618639927.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19f9cf82a---68002685336.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/48398196256.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/97657271180.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e219e879b---tibisokalexutuxisuzoluz.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofanuzovewabamenugedal.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/vabiv.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mukoxewolufusokojexiwalaz.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/57732143269.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dce6b24e4ee76c3f952b2ffb0316ddc8/42318531113.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7a39e4fb76ff38939a2d19dabb47bdd6/46840024956.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/95326515574.pdfIn PDF document text
    • http://attlas.center/userfiles/file/7129880994.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/xarelejiguraworurebopig.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/37388110803.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/81140461045.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wetonagufiwagoza.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/35965918760.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ceffa79b6---43671283662.pdfIn PDF document text
    • http://bronia.org/userfiles/file/36419525262.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebfc1560f---sijaxud.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/966cc25d9db1dff8942d52fbe35ff09e/7091397234.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/24852284390.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/94773804579.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/54056718874.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10928 bytes
SHA-256: 0fb4f942848cbda24b1c39665c0ac28f7b8897f2e99d88a63b89427e34982f04
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 17788 bytes
SHA-256: e799a3a56b38002612491f58df2a73e256c60f99f3a023888c5b567e390dca51
font_02_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1