Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab58411f475fb705…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7b436734999632a7adc0659a748dfb3 SHA-1: a0c5881587314c92ba2788f7302de52a6ced0043 SHA-256: ab58411f475fb705a43e72cf1b8132dfce30e899454cc5153c5c9f7e190da66d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating random and compromised CMS upload links. The PDF contains numerous external URIs, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=mobile+app+emulator+chrome PDF link annotation
    • http://xaydunglenguyen.vn/upload/files/8a23fd.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/11409796262.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/nikujedivefatamogur.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/dejavobo.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/1026230574.pdfIn PDF document text
    • http://medrea.ru/upload/files/19269464072.pdfIn PDF document text
    • http://carbonelite.ru/file/91126356924.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70159420544.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/lunuxavibovo.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/91075430079.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/rogejelodaxosadosojemupu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc0caf0a---33533401549.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/nixaf.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/91007717367.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/tokuluxerax.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc418f6d4---66288884380.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/livixur.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/86218591449.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/61844189904.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b29d68cb---81779120739.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/28559311430.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/97648679093.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/rikinubimedavonizoba.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/dowagevemamobunaruj.pdfIn PDF document text
    • http://henca.com/files/details/file/11262672539.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/72381846804.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 17004 bytes
SHA-256: 7c36c0e435843d3e8434d52476258ae9c0ac2a23564688a213231aad63fb9456
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 10600 bytes
SHA-256: ca69c450196f7127b9a405ab7193f52a74704ce17ed900702cb8628123c57081

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