Malicious PDF — malware analysis report

Static analysis result for SHA-256 5830a0d94f155092…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 10:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65830493955c76b25ff89bf42111d23d SHA-1: 9e29d9896579cca0e30785cd7de34158bd500ff3 SHA-256: 5830a0d94f15509291b9b3d888563bfd330c33598dae7f69102c1a646ded4611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable domains. This structure is characteristic of a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/34179036047.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d236160---28222529616.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ad75a008---panuvewekipe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff29125b---91296246019.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/86723247935.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609580c7ed361---golomibufopofesaxom.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9380164245.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/pojevatodamojexujetamak.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802061ad526---sululenutozidowokononed.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/valaxepopemobozabiv.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/zifaredav.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/41481456813.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160beff0c9c59c---gazodejobesomukisof.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e2ade0a66c8ba99bc96158a38c7945e1/tedowojibojoviwel.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/948989a1sl4ms2pbe73ab3qu9o/48840362023.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/zefanopipazi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ddd48d1607fb9404083316fb1baebf12/56206219947.pdfIn PDF document text
    • http://normel.org/files/upload/file/44307217695.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/xadipavix.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/moguroruredawedakivoruriw.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/jinuzakosuxopejufa.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/jamomegafuxezomimunelipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=importance+of+conserving+the+environment+pdfPDF 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 17976 bytes
SHA-256: ccf63b9709986d4851bd31c1c0a5255899b65f546bee20f65ed58e27e359c955
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11036 bytes
SHA-256: 2a1329c4bc04c086758ee6d6f8b23279caed5fb528f2904d21d6fdc3058a23af
font_02_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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