Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbde26261159fcc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 09:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 697a85bf1d3f3912b2a978fb6c88b66d SHA-1: 3b003cd711fc35505e70dfabcae5edad932fe446 SHA-256: 5cbde26261159fcc1e6bea047bd241f19d299847ce2ff88a5133a865b825cfae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The presence of multiple links pointing to compromised WordPress upload storage and other disposable hosting services, combined with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adacu.org/userfiles/file/20210702220538.pdf In PDF document text
    • https://penzionradvanice.cz/res/file/57937343793.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210727_3693D9EC69E0F758.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/3026744278.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609571339f299---35242475254.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/96847248497.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13aa18a9e---tulozarare.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/75440561788.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfc6dc12c---ropexaka.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/redoselagixa.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/dumoluvu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/23659344004.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/38056543836.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3a5cda89cc6c5a70f75decb976348de/wurutomapilonevomideteme.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/84184894158.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b745bca952cdac5f196516d41184f65a/reridedojazesomegome.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/3523299803.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/89219146885.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520154209744064.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lepewutojediwukes.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/risikem.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/gaxawubejewuxe.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/18561650180.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c250970ec2---60457836667.pdfIn PDF document text
    • http://congluc.com/upload/files/59394478568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=incoterms+2016+pdf+boliviaPDF 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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 18180 bytes
SHA-256: 74932fd76d2a7387c05d811b445c1eb54ecb7a0a31006dc2ff5d6b3ecc39fdc2
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 11400 bytes
SHA-256: 6c037410f9f52fd2ab8d2f4ac32f415d2cbddfd855ab54cccb9da35a34d53bca

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