Malicious PDF — malware analysis report

Static analysis result for SHA-256 6567a4c038b28941…

MALICIOUS

PDF

143.0 KB Created: 2021-06-22 18:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9566532f8e914a029a561d3375aa8f6d SHA-1: ff569d9638c87bac6bea154389e5701769cc54b5 SHA-256: 6567a4c038b28941903c29181f819c5e031994d9d5df78b888bebd2c08024a09
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=plantwatch+pro+manual PDF link annotation
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kijaku.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7997a484cd93e1ae8ef556006d22e1f2/papejaxezimutu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeffc0a1f8a---lemaxinirurizazeg.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/06bad701647d5528feb8204b70e4f70a/sitorenibakisolejoden.pdfIn PDF document text
    • https://paperland.bg/uploads/file/likasubawujoraferepezu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9f61a3f2db98f423c5ed43027cf03f71/83849185625.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qehjhmpl07tv18ibruvas3rav9/kulepazoxuzotutop.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/banonalogazomajujexes.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ueqj24ut3lmqq4lq8vfdhsf76g/zavegalevigulev.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/90891936975.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a4897fe1a5d5a22c26ec6af19ecdb67e/15470042163.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7685f1d7e4bdbdcc3a28b04bfd7dd281/89616860160.pdfIn PDF document text
    • http://whatdwellswithin.com/file/zozodi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wubutijiwajoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1CF 4804 bytes
SHA-256: 8a4c834f1eb647c2181c8c8822dcda2d1541fbaea4c711c3f2d414be632ab6cd
font_01_sfnt_off0001f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1F2 14344 bytes
SHA-256: 25bcb56f8078683264bf72aec6922ea8fbad93dd7b3530de8bee4709086d68d1
font_02_sfnt_off00021f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F5F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71