Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f15dc05c16311a3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b53c23303468b86f12ebbae3c4db113 SHA-1: aa8c751461a92856db376f6476030729d9cdca3b SHA-256: 5f15dc05c16311a373d9d4104c2b2e3979bc7ff2dfd4664db5489e465d58b561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=live+wallpaper+iphone+se+2 PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/25534779726.pdfIn PDF document text
    • http://mrybalko.ru/files/ximenovoxeruw.pdfIn PDF document text
    • https://flomogroup.com/upload/files/21285076897.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914131004.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138529d97427---winixesesapuwitapinar.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/10935315256.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/bumop.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/vukeviponilupijawadeze.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/21673140813.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78e2dab9---jedizutemi.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///mamutenimubow.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/momelawekifilenoxefos.pdfIn PDF document text
    • http://jcpingie.be/public/files/90507282111.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/52559805972.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416169babac---68300698556.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/50776730713.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131072031407---bufiganakuzedetodo.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/75511545150.pdfIn PDF document text
    • http://st03.it/userfiles/files/35050775290.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/91291948828.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/06cc4e0a901f5fd035e7fc3d961f2cb2/18218224711.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/3332511666.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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 10480 bytes
SHA-256: 7ffa6b6e0309968ae9297d2c000833e696a33497dc0ef784f6f77e45ad1be1dc
font_01_sfnt_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 18304 bytes
SHA-256: fc2047eb102aef554fa2f76115d37370e4d7a4f7992289e8a252820c90a484e7