Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c86d14731cb8d73…

MALICIOUS

PDF

98.0 KB Created: 2021-07-14 01:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eb357446d453c46a2d3863c46350799 SHA-1: 98b89e07e368ff392d3b2d6166931306365652b7 SHA-256: 4c86d14731cb8d73041922e07df1aa3e97216cb84dc3a40dcae6bd7c0643859f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a7e1aaee---62211735159.pdf In PDF document text
    • http://instandee.com/Images_upload/files/sosixowujogogelasowi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8b037c279843407a0973a4982f8c2f5d/redijozoruwozokupuk.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/vutudivibagaji.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e735b826daa---vovopipagu.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/31256349028.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/hjf48454lp3j4c8slfavot6og6/76529734306.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6d088709784e39ce1a26e35b89b708d7/9974129575.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p8f9t22dnp5tt0qqpejlpndiab/nijamevipozula.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a3a4b174db225fb04f753b43e91d65c4/69646971961.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///81249499514.pdfIn PDF document text
    • http://pneusmarene.it/images/file/55729147681.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a829177e4---46364469061.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/62338c7fab81e09aacc57f6ccc99dccd/79257195963.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c35f955---kuxari.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec63dc8d7---57031090534.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sukuj1b9bjgulvdql3bv0jrtm2/68710088134.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/paredesuxulixinis.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e46a5be8377a70fb1e92cdc89b0ea210/xexorib.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73167d7b90ae385393402281212b253f/60943375385.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89fbf00618---zagukudaxupugabos.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2004b5677c2b23ae12a3b2e43e64a076/sejazowexelenofat.pdfIn PDF document text
    • http://prosquash.by/data/46821700492.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/52249349090.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/79930581140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+play+alexa+and+bluetooth+speaker+at+same+timePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 11284 bytes
SHA-256: 07b3f785e3a518aa58615c872f42db2acc8ab3639896aeb1f82fd1eefa392ba4
font_02_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 17684 bytes
SHA-256: 806b43255d64b6cb496b3e05f63bd124f034a8d4a5644c5cfa1ec838279c0987
font_03_sfnt_off0001639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639C 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a