Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdde6dd79ba2ece…

MALICIOUS

PDF

99.9 KB Created: 2021-07-15 15:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afdd136620a53130a2370a14597dfc50 SHA-1: 8d236aa82b75e82370d81d797d2c2dbd489c26a2 SHA-256: 2bdde6dd79ba2ecec8fa45c728d96f20683aa180a517c4d79cda634113f16a85
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/097ab406bf9b9ebe5bc004e962fae5b2/51937884640.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/datuk.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f5acd2e7---13006132847.pdf
    • http://qytbearing.com/upfile/file/8816020896.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ac4338d---95554928282.pdf
    • https://widepolymers.com/userfiles/file/71560693508.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9349160a8dce0fa464a2dfbe8ac90a20/somikopojefugukaw.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4f5e4face---53934749397.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bdbd168d5da1ed6cc1874792850a4b9e/sexufofajova.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wirazizerozodipasuz.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/fidujinaridepifemagebo.pdf
    • http://minhledtran.com/luutru/files/27457174497.pdf
    • http://dolphinegypt.net/userfiles/file/sugakagetozixu.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l18k63gn1eas9p244nftcv62gs/60774661433.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2287b63ac---pefiruvojejefi.pdf
    • https://hogies.com/includes/template/uploads/file/sokoniwusawakeve.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6aea2674---96437089133.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ed3bdab35dee0cbca9183d386d8f4c51/38447640054.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b441542b2cb---mekuzesaxinediberalelewu.pdf
    • http://mamam.by/upload/File/file/95682606764.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160873c91aaf81---jafezomusedagajano.pdf
    • http://location-venise.com/italie_documents/files/fupaserawufo.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae0062b5a---15829220630.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+past+tense+of+cling
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccf.bin
b89cd2161b55e76eee396208eb70f808080b45f77829ac0566df2334fd842038		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 10652 bytes
font_01_sfnt_off0001052d.bin
f0a384abd4a6b1493a233c7b38873a2798e08062fc669f6881763400e76792ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 17700 bytes
font_02_sfnt_off00012034.bin
dbaedb949e59cff2651fa70f661f09b72c2d8349ba5b993ffe1cbadf3e64c9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 24028 bytes
font_03_sfnt_off0001597b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1597B 16792 bytes
font_04_sfnt_off00017188.bin
ee6894879af58ee5e4d8d5d26e4d81d448a7aa8423abf5082fdefb80e7100d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17188 4128 bytes

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