Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c61eb4db509e4a…

MALICIOUS

PDF

89.8 KB Created: 2021-08-30 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6095965e87a2a41db6278fa16da9896a SHA-1: afd6f299a21942e613444bfaeab0b2559c4024ba SHA-256: 12c61eb4db509e4a0dfd0e1a640695584c7ccab71eb9b52dcbbe069c58b2d88b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The heuristics indicate a link farm designed to redirect users, likely to phishing sites or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://queure.ru/uplcv?utm_term=close+packing+is+maximum+in+the+crystal+lattice+of PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/62de91accf2e4e69ae437f9aeef4e1b1/93087626835.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/767e6643e55b3768c6db99ca315bd849/76422647423.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eaeda2534---janunodaponamenabonu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e5a8185b---86601429212.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe839d588e4---gagevuzabebafuk.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/8046015963.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/59113941715.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cuckjoe2l4hfpvar5ur096vvsg/22431383116.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/juvumoxava.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/5528b30a437a056c9a5163cd45be8d8f/16768755645.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/78948839456.pdfIn PDF document text
    • http://fitviewer.com/files/file/zakazop.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778fed76fb6---kebiw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1220f02f---18084350432.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/giwuganonam.pdfIn PDF document text
    • https://7gking.tw/upload/files/69416667369.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/49964855476.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9f5cbdee6---rigepolapij.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/96833504324.pdfIn PDF document text
    • http://gapp.fr/medias/files/88058368713.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/kamivajuwunugoroda.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea9e8bc93---pakumuzedobadojo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/56686629253.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803f0f27478---4298967369.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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 19712 bytes
SHA-256: a8bfc69d6cdd6eb9cff38c7a67a1205dbec5de3d64eb98b68e75d28804e2f182
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 11368 bytes
SHA-256: 2d169021cc1b9c75bfbc9ecf2004059fd8a587e936ae07988c390beece5a86c2
font_02_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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