Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a7b9f792b528a…

MALICIOUS

PDF

74.8 KB Created: 2021-07-31 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f04a3ea0d83c6b1709473cd0eaa5cf60 SHA-1: c3a4e73607dd2ab5e2de6738f2c7f27f634cf0dd SHA-256: 5b5a7b9f792b528a54537157a6005c2920017cb889a4dab9c3d9ca817fd821d1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5003

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.
  • 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
  • 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://pistant.ru/uplcv?utm_term=geometry+dash+2.2+beta+descargar+para+pc PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1ss801r95h87f4m7kgrfdirfs0/64530730384.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210709_9ca52.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tirajedozuxasozawa.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/96476786196.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda28c826af.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/86621623089.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b63240e2089---xejaf.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7ff9ca85---porerizitagidokilemaxaz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164e5d9ad6---xeferuwumerug.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/kipenafawarubowizuxalu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fadopebinodelolisubo.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e859a114d896a3e6ef1bed6a99a3cce8/retenelebopatov.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/natufexagenuriku.pdfIn PDF document text
    • https://kultmotor.hu/images/files/lamiz.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/q8gm7364aaa6gtsibqhkf8ale1/82542595823.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d4b48fdca985fe4f6b128383a26f3ed0/40266907529.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/66427522231.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/28498153931.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d87375ec---46209526342.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2379d41d8e67679a9760e63cc45b28e3/jajisonodisujalobigevar.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a45534e7ca4---48510649556.pdfIn PDF document text
    • https://buka.ru/sadm_files/taxukekafaledavufu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wemiwunevul.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67aa46a9e---4406317827.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/galibowebipa.pdfIn PDF document text
    • http://uleiuri.ro/userfiles/file/fofakokogop.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 11196 bytes
SHA-256: af6a66e37f501c29644f240c43be10de415e0a8fe9c764c43ffcfb81e3ff048e