Malicious PDF — malware analysis report

Static analysis result for SHA-256 2654fdc694478be7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 08:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 892cdb03bd6367ab5449fc3e0c7f1bae SHA-1: 587b769d3124cf8c820917f1f95b4d336d76a404 SHA-256: 2654fdc694478be7bf0549367fbd69268a883b4846788ed17cf45b603a6e1c08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=lollipop+5.1+rom+download+for+any+android PDF link annotation
    • http://kondicionery-elektrostal.ru/upload_picture/file/rezafifosagofuwovaze.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/31286905875.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/bupiroxenota.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/lofodurit.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/95346224756.pdfIn PDF document text
    • http://sswjeans.com/files/purodadaren.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/vudofidiperufej.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/18230030577.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/86768163589.pdfIn PDF document text
    • http://ned.ru/uploads/files/98056179096.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/nogurerapulizenas.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/5548773185.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/wuwebidaxasolemukegulil.pdfIn PDF document text
    • https://kimcert.com/E/file/kuxolapilum.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/76338482189.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/vubam.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xemine.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/29051978039.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/35912890225.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea14c71fce---4163123730.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2305a141---sokofetipoxabife.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xutisiwagabakowekowigapi.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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 18132 bytes
SHA-256: 19a6c4e676d5b4da099709f230e8a7ebe5dea14296ce029193188d97a37a82ea
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 10672 bytes
SHA-256: 784f62e3c490dfbf226515fa0d97e5a65585c17026b02cd578636163aac33bbc