Malicious PDF — malware analysis report

Static analysis result for SHA-256 524673217947ef40…

MALICIOUS

PDF

74.2 KB Created: 2021-06-08 19:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0baa6b5d5894c456f9a35597b6fd2219 SHA-1: 261200044b9147ac8d5aa70c79e73fdef8c8484c SHA-256: 524673217947ef400d716d9aaf172aff5b37ca157bdddcb9e4886186a2fe8a17
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely to download a second-stage payload. The document's content, disguised as educational material, is a lure to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=chapter+wise+weightage+for+neet+2020+by+allen PDF link annotation
    • http://albino-pitti.com/pub_img/file/2832380714.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83552c9a1---8148005413.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dd1dc0341eb228bbd795f406bf0c97aa/timipoxek.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/melisemuxonizosogigamalim.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r88etri3eevjqe9q36qg38p2mv/kiduperenub.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085afd7db1b8---dutetu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a957cfc40d66b081836646ab461d6807/gatezetodo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zozipunodugozovenet.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b267cc8a2---99884052944.pdfIn PDF document text
    • https://tepihtrava.rs//files/xobegako.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/54120831186.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c0ea88d8---68857216526.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d8ba22163cce45cd00fe2f54f8b79290/wajumab.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/96447225087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5676 bytes
SHA-256: 6dce7348e0635714550bbbeaf2062062182bed7e8619586b4106da13cdecc502
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10732 bytes
SHA-256: 5d033f9a8a94182e3bb5ab3ac2fd912efe0661a9fc6b03ffb4c2d692b678c8a6

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