Malicious PDF — malware analysis report

Static analysis result for SHA-256 4599a542b6c7efeb…

MALICIOUS

PDF

205.3 KB Created: 2021-08-09 22:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a13139e823c69b156aee4982ea3e706 SHA-1: b148262ad41a0134fb57bcee9b9c02ffbbeaaf0e SHA-256: 4599a542b6c7efeb03e15b6edcf823ed2bada3fed879d5066d72494fb9a71742
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=simplifying+radical+expressions+calculator+mathpapa PDF link annotation
    • http://jjburgerut.com/uploads/files/24065856660.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c719f1807f---loxolugupalunenodepa.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/dejagikapexelediwojep.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/nagizivopunamuvozeler.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910cf3a76b---84147217990.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42df78455---60536495774.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/75b4f088cbc1e3215bb4ba2c222ccf24/42921193212.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/lazofadalipanuluzif.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/27v53i2n472l0ljhc7allphcn3/wilubutotomanesita.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/59812310490.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3dce55721d4d322d87399b92d5415b19/18422674948.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dde27bed7---51867647418.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/15145178542.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfa89b267---dobobukuripasaxo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5cc70c557cb403473f97aa2409c56619/popodaxetem.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/29495926584.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf3b370c6---sofiwekunuxizenover.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/vezozosekixaxawuxewase.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/77262900641.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/tusitij.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e09a3bfc---sateginolofebuwogox.pdfIn PDF document text
    • http://allycatering.com/userfiles/9202581755.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_off0002bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BEE1 11460 bytes
SHA-256: 9b33c8ac4665ec6d04b3618f9b368301f859130f290995611e261043a5abd3b8
font_01_sfnt_off0002d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1A2 20456 bytes
SHA-256: b3667d9768c728c4574d18d18dce69de5cd93ad191b39b505f13f0038b8adccc