Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33a42778a59ee39…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 16:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a36e28f630ec1baf787c6b9910b10365 SHA-1: 64a37ff94bb3d6eda500e613a9822b08ef56e032 SHA-256: b33a42778a59ee39e13f9da2a941339ad9ce43f67178c0909f56d0e883e73fbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like downloading additional payloads or executing phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sporteambiente.it/ckfinder/userfiles/files/pitabadalekamaruzuxakos.pdf In PDF document text
    • https://petrovsky14.ru/docs/files/wujevudozobevufini.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/56867120827.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d8785e8b---zadufavogemumofopulera.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/dikogutuvotenid.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/60973503383.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/8405277990.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/fusojeburev.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614907634c5ee---pezofifi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/32535925275.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/bujeri.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/38659191833.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/69903820171.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/48147097156.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/64030952274.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/82260507857.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3rak07u8rqe99q1sj9cut537g2/9815669479.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/18953892425.pdfIn PDF document text
    • https://go2germany.ru/files/file/32801637228.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32861171233.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/59415365313.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/27679260889.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/misitinek.pdfIn PDF document text
    • http://portableandcool.com/files/files/4792875475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=random+gift+card+code+generatorPDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 14948 bytes
SHA-256: 3209812d26cec5638afbf3780e9a5eec027faccacc3a02e5010ef818f4821564
font_02_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10648 bytes
SHA-256: 2f01add7395cc0b139da059f83ee404fe45fd2df69c277561d8e6ebe2d67bf1e