Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f9d2aa00d8137c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-12 22:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68ca9bf1b4b67e2bf2403bcbc8537947 SHA-1: 0af3de20d05da750832bacb2a36315e3e0006a6e SHA-256: 44f9d2aa00d8137c08ab4a406c4ef3bc9d54f98bd73aa4c304f7665b7a024312
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links pointing to compromised WordPress sites, many of which host further PDF files. The heuristic firings indicate a link farm strategy, likely intended to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 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://catamma.ru/uplcv?utm_term=gender+inequality+today
    • http://cuahuyhoang.com/media/ftp/file/jubilexukakeligoludu.pdf
    • http://atomleasing.ru/media/File/77424019179.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/xigamewiwejibafafex.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe53334428---pitimidabokek.pdf
    • http://aexpress.lv/index/images/up/file/63373487954.pdf
    • http://innova-perila.ru/upload/files/rugabijogig.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/p90s67gjr7lmjmm3nkpj79hrjv/janufu.pdf
    • http://zulassungsservice4you.de/bilder/file/xelolijejis.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c98773b3f---56326261171.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6376eca7---63716377468.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6039c1221a---sesebeduw.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e7a7767ac75949bb0002f0a34a76651b/60385498072.pdf
    • https://capecoralliving.com/media/file/14872795842.pdf
    • http://ahchala.com/img/file/48511126034.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/58981337062.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608378359a6d6---76553754153.pdf
    • https://mclandpin.com/calisma2/files/uploads/22699710044.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d07e0289---xemuteza.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e22cac5c6---29458006368.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2b97ccc81f3558c3e6f700faef415f93/jawavizakamusi.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vlusu1nhua51n9oq5p9kieh4i0/94623183192.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd73419ab53---43698132537.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a71049a0429e14f35a2777fff5833ed0/doluxovikomopites.pdf
    • https://maydangson.com/vietkiendo/upload/file/zopemata.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59b37f3a0---kubeverobuwesavepawuf.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/rebepufoxexiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 16792 bytes
font_01_sfnt_off00011011.bin
e383d4ca3f5a809dc5a32138f581ffe2a93b437511dc01dcad95b66700191200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16356 bytes
font_02_sfnt_off00013a86.bin
bf09a747609d52ea38b062881cc6bf4c1c39e5bbaa42cc2d5d33808473706d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 10472 bytes

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