Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78568437b9e2912…

MALICIOUS

PDF

94.4 KB Created: 2021-08-07 19:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f8e18a7a8c3927ef4e73302bf70c37 SHA-1: 3bbe58b9cb0ec06cbf83be4731f1f6a0967d6e3c SHA-256: b78568437b9e29123dc0f1e28864cdfc97d10282a8e4092632795bb26dd4c8ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or potentially malicious websites hosted on various domains. The presence of numerous links, many pointing to WordPress upload directories, suggests an attempt to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/542f0cafa48181c60a8f2e18dadcc31a/76776905010.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7d9bcd7b---11549689016.pdf
    • http://kadh.kr/bobod/upload/file/88378372906.pdf
    • http://braciszewska-klimek.pl/fck_files/file/sizaxebowarebofazunesa.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/641c7fd687c0ba31dc40a39edcd50689/refazexukoxuzodevofopot.pdf
    • https://hondamienbac.vn/userfiles/file/munigebofexujelalaruvetag.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/utk7gl71jf64pavk9bvcmip3p1/napokiv.pdf
    • https://doktor-ara.com/userfiles/files/vivijijuwifetaxakonajazit.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/32733749683.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05bb50f6d---95653918369.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/69da31e0057f93702c66b4990e73ec69/pelikixijuvufanis.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/208d88c8e5160e4ff1e1d66b6ecbd54d/zumisezijokijediku.pdf
    • https://a2designbg.com/userfiles/file/noxezamopim.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1f1656944146e051ffbc67f9a36a68cf/fusifupajibuzetapawu.pdf
    • http://studioaba.net/userfiles/files/junipuvisiluniweriwakorev.pdf
    • http://www.bandungmesin.com/file/32686799511.pdf
    • http://jrpst.pl/userfiles/file/zijozoludiz.pdf
    • https://medius.sk/userfiles/file/jegijizarinixaxejo.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/24072120080.pdf
    • https://soechi.com/userfiles/file/guwowolo.pdf
    • https://cahayamimpi1.com/contents//files/jewali.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/xojimuxepuluxagemukuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=substance+use+disorder+statistics
    • 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_off00010b74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16792 bytes
font_01_sfnt_off0001238b.bin
aef49291f8a85dc8153d63ad8036854cd80958d255accc15a9a0585c28ff6f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10632 bytes
font_02_sfnt_off00013bfe.bin
98dc9b4363998ed9eec120cdf11033373acd20c9915bd2aeeb21b0f2b490e778
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 17248 bytes