Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338c3da803435fc…

MALICIOUS

PDF

73.6 KB Created: 2021-06-11 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8920392fcccebd2a4e22132d8d94cfbe SHA-1: 5644201471ac699c8a2158e1ff893599ca81e81a SHA-256: 1338c3da803435fce5154f7c37c24841d621ee31e7c1ac24027dd25c2986e5a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to exploit user curiosity or urgency related to the purported exam document.

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://ketchas.ru/uplcv?utm_term=anatomy+and+physiology+1+final+exam+pdf PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/gujajonukavakidojunuz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9ae2b413d647ddd82ee033f2c95bb0d5/7531387897.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wudiwuridaxupu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a908527a32d---23501456439.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ea4eab---85013465462.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/kemegamigafukafifiviza.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/15098917657.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/20289351460.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/newineruxevewe.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/44356260954.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/2875e00f9a39be04f56896233c1e9c13/38268814455.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/nanexujezasim.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/panufixokawigu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/famulasivas.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5572 bytes
SHA-256: f87147eed401b9bfb8df9ff85e99424fdbc42adda701816c8417b03444f25461
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 9940 bytes
SHA-256: c560ad91a927c31631052fb3ee4fe6917d415e13baee42b02b43bbdbd8f1df84

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