Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc99ab8801616d1…

MALICIOUS

PDF

75.1 KB Created: 2021-06-27 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33dd2876b57cd12150afa78d2a44a187 SHA-1: 21c8626c4ef49fabf6ef205341cf97ffdc4ec300 SHA-256: acc99ab8801616d1738de042583316d62d307b75344bec688940ac2181accc32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for malicious content. No scripts were extracted, but the overall pattern points to a social engineering attack designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26ea6eea3---30422118249.pdf In PDF document text
    • http://radio6deenero.com/uploaded/files/xasapenexus.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/4262380411.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/besinibupobilaso.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rutuxejewe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879debda0b---mopazodavasakizegedoli.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/cbkglhj4po14kqufua3kerkask/kurogajakesem.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/kujavak.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cb60af22---nilitotukexodol.pdfIn PDF document text
    • http://salkim.com/userfiles/file/82035543739.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/zekapemenidopen.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e497724184---gobufi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf68f0434---19500217120.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ff59d902---44041639127.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/bobizavawizi.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/92450424007.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vr9q98ueeotvnn3ij74al1aat2/kajagivobidosederuw.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6fp4regcjdjrdaomf8juke69cv/62133211111.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/pitiv.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33ce7dff9---meledejoke.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5782715d3---valesinamukigotegi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34c075466---41724383097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=converting+pdf+to+excel+online+freePDF 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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16652 bytes
SHA-256: bbb171fc2c8d41a9b7465543b35adc8e169a595e2258fd7bd5537d19d1d5d8da
font_02_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10664 bytes
SHA-256: 85145b4139ba1c1b657798f356ee449b2af7b5562ee1876c16863aff02368bf3

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