Malicious PDF — malware analysis report

Static analysis result for SHA-256 282368f50d2fc8a6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f128c9ccfda929bf751facfc05fc1bf3 SHA-1: 97bafcb7c3fed47dbcef0ef83d94807b2c9a0605 SHA-256: 282368f50d2fc8a6699d2e73f495064e76d3b5edaf3dd23ff49888a2e61e5502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://citysoupsbellevue.com/uploads/files/tidarulepasosufamig.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2f21bc1c---82669558935.pdf
    • http://evohome.pl/userfiles/file/segoxuxonegabegelatepixet.pdf
    • http://naturalwonders.com/uploads/files/7269081145.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/neligajene.pdf
    • http://ornito-silesia.eu/userfiles/file/mevepofajo.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/19919326343.pdf
    • http://fabrikando.com/cmsimple/images/file/favomojevezibitifeme.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fbc9d25c4e2220fed302c43d8df4bb60/lepozidabuvigunus.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/40494797681.pdf
    • http://biemmecommerciale.eu/userfiles/files/33995679705.pdf
    • http://freetds.net/userfiles/file/25225167173.pdf
    • http://dribblebar.pl/userfiles/file/novasajizo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfcd466946---wokipifapebaxasixuw.pdf
    • https://tiklatakip.com/calisma2/files/uploads/womazokuluxelibe.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/bafemozokomel.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/99ia8332oo63ee73p40d4qjlkt/94194701428.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a265a90175719e53394af0d8de1c0e55/9719479265.pdf
    • http://malbreil.com/userfiles/file/84978915708.pdf
    • https://nistd.in/userfiles/file/823160244.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/xoxikawaxajigitij.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcf0d2660---tewaludexakefusiwujoka.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/jetomanoxokasarofeminadeb.pdf
    • http://lavalnerina.it/userfiles/file/zupukopofejojozonizizip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wolfram+alpha+apk+ios
    • 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_off0000efd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
font_01_sfnt_off000107e4.bin
923ebb4b4af4265e4404fddca304ae01fb121e1d6e9f95197bfc760f09d07a80
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 17724 bytes
font_02_sfnt_off00013639.bin
6a8aadea1c8767401f6d99c6be7322e904d969a945dd5dfa796477e0f3c8850c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 10376 bytes