Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b32cc6e0929ca57…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 15:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e67bbbe05d004e548935b56471fb083 SHA-1: 71953584d9c794a4bcb2bfe69d70b9098e79c951 SHA-256: 5b32cc6e0929ca57252860ffa8962335aeb2549b875f089ab7ffd2807c5d8194
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=how+can+i+restore+deleted+messages+on+my+android+phone PDF link annotation
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/futubowuropubulaniden.pdfIn PDF document text
    • http://innersolutions-uk.com/file/defigonafetezeledepomi.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/60509741759.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/23119318820.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb5e4f31c---satubebetunow.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8ffc4f6b---jumejuwepejoxapepafiba.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nokele.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/70275014613.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/dotutin.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gemodenuseladowobogibite.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/34383445489.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/89681100554.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/67199256801.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/97o30ovih1jt8g6pkpqj97iobd/betasakinoragepojaju.pdfIn PDF document text
    • https://mimpidia.com/contents/files/nerigiwaninimosazepe.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/jowalupuxosegesakobunoroj.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lopunuxom.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/230ff9a3ae34f8af1ba47bdda1e540de/5441212512.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/51315750244.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/51841014335.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikunires.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee758f8e8---negekifiwotir.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/winakefo.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/wozamabefupusuvufazu.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/46869300615.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/87736572522.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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 11152 bytes
SHA-256: c192cb1aceeaa05deb6ecca6f4797a8f157f58e39649fd9b66bf8a61a2d705f7
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 17240 bytes
SHA-256: 533c8f007da692181e3d40a512ecc93e34950d3a656afa2459e5da4a2d673c35
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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