Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44b395f072881f9…

MALICIOUS

PDF

90.8 KB Created: 2021-07-17 02:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fbf81168bb7ce5e980d69f6156bd1e8 SHA-1: 687fc7a332ea16d603c5a9d71666e6d1703e4114 SHA-256: c44b395f072881f957e81bde40618b7f1ab40ebaf332095f706c8c489ec55619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to initiate malicious actions. It also features a large number of external links, many of which point to compromised WordPress sites, indicating a potential link farm or redirection scheme designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://amadpich.com/userfiles/file/tazifeferufovezuf.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09673720b---titozaludasururafibes.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/84462861259.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/16e4ea61ebed7902a00cdeb1377fbade/sufawurixoxabetuguja.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c918e607a6b---kumasibesagalokunofutikef.pdf
    • http://alarmy-kamery24.pl/userfiles/file/6743442286.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/fisavemajixuxukodu.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nitroiqkhfa47legce8rnmc367/65904055308.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wotusojexasexovupegu.pdf
    • http://doo-san.com/userfiles/file/20210618034224.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/gulumut.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609253b934ba3---22007164671.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed7b24176---38287726944.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160779c2ab42c4---36914480309.pdf
    • http://ibb-online.ru/f/file/45595329485.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9faa0e5720152c9992c6de874f3c446/mezibeludemupolekija.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1916fd8f25---89853013438.pdf
    • http://whewfamily.com/clients/12004/File/fuxujofosekakanirafel.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8925f082---47123675946.pdf
    • http://savaksangida.com/resimler/files/38122871729.pdf
    • http://grandrosso.com/js/upload/files/dapedoketavipi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+kind+of+soil+does+a+peace+lily+need
    • 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_off0001026f.bin
f10093e8e3ceb53c83d87c55a66e74f06b12b78cb59ece80132f3a901f75b8f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10816 bytes
font_01_sfnt_off00011b5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
font_02_sfnt_off0001336f.bin
659695a1868ac917406e297e62603696d8504d552da41f1fd17772638adf42ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 16392 bytes