Malicious PDF — malware analysis report

Static analysis result for SHA-256 9832579e0c64274b…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 12:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e0e6b0f86fd840c879927c3ae9d601e SHA-1: a165d630de71f95824a6a5e26b45e944a7953256 SHA-256: 9832579e0c64274bac16a328b6adc9de267ab6f2ef1492411a1572d4d82e326d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=glee+s1+songs PDF link annotation
    • https://futurefacesmiami.com/uploads/file/silosikezuf.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/fofaronafozomumegojoni.pdfIn PDF document text
    • https://digicpictures.com/downloads/29010752822.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922114262217.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/11596118990.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/59289123242.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090802435893567.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/labetokuxizanibimut.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e989794149---bedaganutowoxipelafego.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/dewusomavuxas.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kikepuropurimifuwew.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6t3cm53i4qakl2ipn375dfecv4/lofukomu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/89108483078.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n1vs305d2olmi7umjtpp2gha35/fusoziluwu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/55549013616.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kejakijozopuxodi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/doretepasuravugetezulapas.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/28249588198.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/rujorapedasopeminevonu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613150e358e9f---nokizutidanerebow.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8058073599.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/basekabetusiwesinolewamuk.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_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 19224 bytes
SHA-256: dcab0153818168806c80c4511a3917647706615c11d9114cfa6e897aeeb4de3e
font_01_sfnt_off0001364f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364F 9924 bytes
SHA-256: 5b828a279bc3ff40bc91838b2017cf6d1c647ad147672584b02928f0498f7220
font_02_sfnt_off00014c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1