Malicious PDF — malware analysis report

Static analysis result for SHA-256 03342add3cc15a5b…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 00:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c51dc128c62130b9e40290751a42e0c2 SHA-1: b6a5b22134a879086e495edd6d49520afc73ff59 SHA-256: 03342add3cc15a5b288f662dd61bbf660678fc1ed6294f18c8dabee0209fba45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://queure.ru/uplcv?utm_term=how+to+get+up+early+after+sleeping+late PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f56116a2---7524607284.pdfIn PDF document text
    • http://cityfate.com/files/files/25223386480.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/7459939186.pdfIn PDF document text
    • http://wohntraumgmbh.at/vebixit.pdfIn PDF document text
    • http://ekomeg.pl/Upload/file/ninurifeviz.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/51397134279.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/19696211597.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/419daf3eb4f241e7a143c04cae175993/bozizunan.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/20797856563.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c471ce9c69a1a9be5509464bbbb96fa0/mutadegif.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55715354263.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rupimivugizeduxijine.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea494a162d---wikaverutewosub.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c22fa6b9aa1---mitoboweturex.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a22f872c4ccef243e0c7e1735206f536/varojewowebojug.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/70487277574.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/puremuz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082b91e2dbc6---7304100658.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a34fc0133---sovodul.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/98207579430.pdfIn PDF document text
    • http://hueide.com/upload/files/fivopez.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/wotivisupevibeja.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210827221316-biluwatumevusimeti.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/gabifubotolutivijezuziwiz.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731e1e91a78---fuxogudisidu.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/dokereduvuwanirumokeminaj.pdfIn PDF document text
    • 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_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 18000 bytes
SHA-256: 62f49f0b06c02fd835457ce5a0e21bdece51ff71dadfba3dc78611f4a347a3ab
font_01_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 10824 bytes
SHA-256: 29c453f5f0ebefdd316a4d55f630bde8187a217226cbdf50796d5197472c36bf
font_02_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1