Malicious PDF — malware analysis report

Static analysis result for SHA-256 753e11971a9ab50c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 20:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 828a728ed34141a090496e84481541ff SHA-1: 2c8e8d0ad4b3ee17e19d198e21192cb71b1c3963 SHA-256: 753e11971a9ab50ccf32d90b6386d90f1d4a678780a3dfbec66ac486aaf3c378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nanoscopy.ru/uploads/files/butiratijozenuto.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609569fbd71dc---pajowuvewazezifuveduxusu.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/61326610946.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610877a07f51b---danaborarilewowinazijapol.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/28897914526.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2db6c7e0b---53176465864.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/tepuxide.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/kapaxoguzuvefadiwitodobix.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/80526479588.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jamokifuvipuninegitemonu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/nepomefikajulikusamo.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/31234449464.pdfIn PDF document text
    • http://soles2walk.cz/data/file/sinivamuxote.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b138096c03---22809841765.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qq0mggngj6ndo29fkbf7apnne8/31810534347.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163a89e09c---butelilivebatorakovukag.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fff201c04c---2347474919.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rugaserelonapegedakako.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/falexij.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d89ac65359e5d237df7b5e8c4384db2/nabarakol.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/59889808291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=4+bit+binary+adder+using+ic+7483+pdfPDF 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://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_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 11392 bytes
SHA-256: 5cedd3f316e80ae6c934c96834162eea82b577aca9f66ee30443d90b58967f13
font_02_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 16808 bytes
SHA-256: c138b10bc745698ff6c451d20022499f7e0efc5ab93970b97186dc23c44fc3d6

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