Malicious PDF — malware analysis report

Static analysis result for SHA-256 3710cb382cf7828e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 01:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 899ecb96c017c139a2c3cc4dd38ef76d SHA-1: 538b7aba1cef89cc17f63635e898a72f35dc779f SHA-256: 3710cb382cf7828e9b12b1ce9d264386794d5cdfde1b687917a3717116e1a33b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as a link farm on disposable hosting. The primary function appears to be directing users to potentially malicious external sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://lapalettedesarts.fr/gestion/file/josuvisep.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed69fb4de4---loragidopiwifisi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cd6b940cf2c7a45764885ca065ff58f7/depuwofoz.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/b94718ec454cd2c2e549348e94b3b92e.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/96257629630.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60322212937.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oad92p4khhh5nreshiefekopjl/gilixeguxuladum.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/20312293809.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wonusaziwil.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319eeb5b2e4---68890316787.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/35266955332.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/72087019101.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b08a43a7a6b9037fc3b4413bd8e273c7/70581840516.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/19466501605.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/19276323166.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/lapamavebifuduzigozu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/janoxurawovevoneligejix.pdfIn PDF document text
    • https://adikkedua.com/contents/files/99166737282.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/45090996440.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934e46ef2a---75947034151.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/fadumimip.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/0450186884.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/99833759950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dipolog+zip+codePDF 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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 18148 bytes
SHA-256: d0dc47b3c46e13d65941a1a9b86a8b9d5d308d7fbf2ff45b4f08a5ecb2222734
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10120 bytes
SHA-256: 849de791c19717b7a8fcf279dea1ec0aa2672b686d27d5e508959af2977bc6bc
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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