Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d6b396f401a1bc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 00:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcf8f0f92b358f4fb8c791ddb99e198d SHA-1: b639d41470f787c9d714eca313764e1a65a3c386 SHA-256: 53d6b396f401a1bc71396735290e855eb29596bef4258ea43274c2d6ab7095ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://elesud.it/img_pagine/file/jegonutitenefiwipag.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf24a8850---winukonudarovaro.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/xapugogogowi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/nawetusupebuva.pdfIn PDF document text
    • http://elsped.hu/files/file/10736049019.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/70218704673.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613056bcd5b42---63788061404.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090418213063.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/kigexiwigeninikidudes.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/tulugoroja.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bikiruwaxirutima.pdfIn PDF document text
    • http://standdominica.org/files/files/77811545247.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/48115594209.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kagav.pdfIn PDF document text
    • https://angkalaris.com/contents/files/jiboramebixame.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59702490996.pdfIn PDF document text
    • http://htwy.com/upload/file/lopidetulapuxisogekera.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/zinoveviwolavuduxuzexo.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/99136609707.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf2d9132c---romatajulalomudawinumeb.pdfIn PDF document text
    • http://safetruck.gr/images/file/kidekix.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/mawerejagafobupoxuzem.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/17889802648.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/zafoxomuputi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fake+injury+photo+editor+online+freePDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 17732 bytes
SHA-256: 5e0c749119cfab51607b589e5dea26957ffee0bcc420bfddd54387454cdfc6ae
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10840 bytes
SHA-256: 48bf5a04bfa34d09f6b91988c90b919521929cf754f2c7557b2b7b92cfa62e54
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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