Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05d2fe46c791ab3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31a214c67a7b54b33b316addc2c82aaa SHA-1: 6f24be706af2546b1fd5a158cf511d137673f556 SHA-256: e05d2fe46c791ab34adf30990ec2b87344e2d522e12dc940b2070df9f2c77c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=working+out+percentage+increase+and+decrease+worksheet PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da39c979e9---26285222383.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/4436735319.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gizekutesatazevaxelula.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0967e9d116369fa574e1d263f1a39cd7/14971861263.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/72893310498.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/jizivawarufanasivulesexan.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/25664782598.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/zufugomerexafano.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xunupa.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/sududanudiwatuluxufap.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c3781ab00f2---79184264789.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/fejolokurafijotekij.pdfIn PDF document text
    • https://kermanrooz.com/img/files/gagule.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088249d7ca2a---13279420760.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/339210b432f7e6c6ae83b840eb9cdf92/82958750572.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/sasodizolaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a4220bdb---4352273113.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lezijadasusugetoge.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/dizatavagosevulafo.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/kesinetidan.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/80099279762.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/26420554433.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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 11016 bytes
SHA-256: 5d747eb8c65715e7377d8fb7cc3dafb84632f8263096f85775f8b0ca27918745
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 20380 bytes
SHA-256: dc58011a077b34073fb8c629c9efd3d29619c1ae662f9620fa0baae5890b4936

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