Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30bf96ff789e476…

MALICIOUS

PDF

71.0 KB Created: 2021-06-17 21:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d70fabefcd561790dd51308c0ff7c3ff SHA-1: c259d8cc3029d6f57922776e6586f7b37410a187 SHA-256: a30bf96ff789e476377cd840ddffffbc807da8d3deb829484dfcb9683fcd9d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure for educational materials, directing users to potentially malicious content hosted on compromised infrastructure.

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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6885ecb---66431942644.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a051e203d6d1343b874f45873f6793b1/57623774575.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/82345616999.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/6248557937.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fbc5d20e0---860749156.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/92255181920.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jejefakigutulusonutoxun.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/96110173402.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e0be22164fd06eab964f42338fb7eff/1612366611.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5330158c7bf830839632bdf1f2ba8375/37540417078.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23d0e80047a730095078184718a1bbf4/75729729474.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d799c8bf1de7ee017ba68b5c6fd63d98/18092815539.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/vujobojobug.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082deb778726---lojipuzafejuxu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/99872534557.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hednum0qlsovoi1k30ng4dhao3/90423917690.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ad83ff5---mipuriboletonavabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rs+aggarwal+class+10+maths+pdf+downloadPDF link annotation
    • 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 5864 bytes
SHA-256: c717d3dd285dc3ac604fe91211a483c19db6f203831c4c63f6819e041ba77638
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10536 bytes
SHA-256: f23ea54c730afafa9262fdc6aa1614b25f9042b7701f5dbafc9e8367cfbfb62e