Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbef524bb057812b…

MALICIOUS

PDF

75.0 KB Created: 2021-06-18 09:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 252043f0a0ac485cd8515de5a9313ad4 SHA-1: 891071f92a8754f7da3ec97ea440defcad282df5 SHA-256: bbef524bb057812ba5815411bf2d98f10dd15a81f6626e65e8e899d16e27208a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This suggests the PDF is used to distribute or redirect users to malicious content, likely phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soechi.id/userfiles/file/5853028962.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/noximivaluxobutedil.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1f6ef37f2fc5fbe99f637b2ad81d792c/giguwonevesivipifutek.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/23e55bbfcf678bc0d3202eb0b421c036/kekomote.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5ncj2v4f2prc16bfcauh32r9aq/47271857624.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u1mes54u2vb0an05c8pvodkt92/41216778977.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0388f2c81---namudofexi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/15409564761.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a4ac706d---18887095718.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/33o30073akrounu9mpnj58r09j/negexazozekigof.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802de9ce024---80298384663.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bc97e4dc266d4699ccf8922972f6a7d3/rivoluwanon.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05247377f---kurokinukokudusugiloto.pdfIn PDF document text
    • http://vhktn.at/images/content/files/26501222274.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/79335083432.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b31fd7aa9430ddf31f0348f9c2c37edd/jejirunosodosumugekonewan.pdfIn PDF document text
    • http://rsst77.ru/upload/files/baxekifaxobiwetitegidawon.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xitebati.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/YTWXjIUwRh0/uplcv?utm_term=henry+laurence+gantt+aportaciones+a+la+administracionPDF 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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 5456 bytes
SHA-256: 3ad87473b16935c127ee407e12caa7d3bbd82d2658efb6de2e08b822a08a77d1
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 11644 bytes
SHA-256: 05537257daf3e614bbda497690b0267cfa785c8cfb88d21603fa36124bdbadc0