Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9e0135b1fad07e…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 22:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10da2a3d4c463c38ff332aa884eb3d2d SHA-1: 173e2a77d87a0ab14e0031652410419b6c48dde3 SHA-256: 9a9e0135b1fad07e63bf3ca2f59b8e6cf1ee4831c2c1c3e70d7c75369457dc3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristics indicate it's part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/36706831105.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8affd43127a753c3e3f3e30357874ac7/6114684963.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030a53e720---32170380549.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/70292289029.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72237955452.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/50220529171.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/lusobefeleti.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/tipemozakavotujusisam.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/filixudamijumuxilofibaj.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/fepupudonekakivikefeb.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4453ec17fc6a98f37a19221a315d40ff/17443747428.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3lj4vuvm9723uv9sc91jn2r84/wapawuwafidago.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4786abf5be49c69ba34ab71270023eee/nobifamame.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609884eb16296---farifetibenitabugitopome.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/tibuk.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/87716759503.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/xarodileme.pdfIn PDF document text
    • https://baongochoa.com/upload/file/filavep.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/73971424660.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/zeregimog.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/19712521262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=round+robin+scheduling+algorithm+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16924 bytes
SHA-256: f55fad837fcca9963aeda6dda962f2415623ae7d6c66d912295866db56fe4f42
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 11348 bytes
SHA-256: 8c135fb1b320b11389e480d9b7cc0bbc8c71c014811a9ded62ae90676bc0d395