Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5cf046059e5696…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 22:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccb7042d7c2ba0f93f3bf501394df8f7 SHA-1: f85ec10855e5744c111411e75f23d9581b50f20d SHA-256: 5b5cf046059e56963f63d0770adfed7a651e64ea692522f0b6101411ad6eedab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=west+end+postcode+brisbane PDF link annotation
    • http://annamsaigonlaw.com/upload/files/98903504820.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903073101.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318b8382a59---xutinoxovagalono.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/wajowagasexu.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/75134580676.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/43353843167.pdfIn PDF document text
    • http://alvitraders.com/files/41558153923.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a79f83bda---37530044800.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/92722779655.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/rixaz.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/tufalotanaji.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144f58a0c3eb---80854091574.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb79a63ed---94258689673.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/96344712366.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/49430731978.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gufanikepujekusupufigemu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312230cdf95---32323538416.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/jerijixanore.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/sulobatofotiguxo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/widepunutidez.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/bonijamadofedusitoxipuvu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/bakejefasegakumijixivit.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109091014506960.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/pefaxaj.pdfIn PDF document text
    • http://vejwun.cz/images/zasiwi.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/57372241195.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10592 bytes
SHA-256: 4ad9f0cb4ba541b95d6fa2235c4cc094cf4b5360b62287c1fc5a14ac2eea5707
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 18508 bytes
SHA-256: f7cf5eec5f277b86d5d5d5cb498af6aa428b89bb70ddb19d1249636f6d04cba8

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