Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c981ba43b79c580…

MALICIOUS

PDF

76.3 KB Created: 2021-08-28 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fce34c06e0722548e43d7c5da3f37531 SHA-1: 78db3750ec0008ee15763dad960673a4e3bf6f73 SHA-256: 6c981ba43b79c58012df46a2998ae9859461f0a8efb3d28916e3fe4c714791ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/s9lkf0qm43p7nik5lkkrr979f0/bupikevamamobe.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/mirumulibefesiwapip.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/xapoxoxemiwezogunabafoge.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/6715465905.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jk5r3ucg4b0ni4cbcl2274d35q/55640137625.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/je9aum8ht4l31v88q8qnlscb55/fopaxejamepiwefexefuviso.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/41069247419.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082569479dab---rotulozozelidapixilewoj.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/90de26ea006827603d42aa3c8c5ba13b/suzajipu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/sasujor.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/7889454062.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/10841259124.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/gedopaxodajisilofomanubo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/3967923734.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25066632429.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4501f2e84fe221a1656f855a86c9402a/77217292520.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b2ea478---lutirevupufoxavatigo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/48eeae3ceef08635a581a8226f57afd1/17668171003.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/69751317179.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/52856026304.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fuwapomotulujurivamibofip.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/gelevitexuto.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/99192592290.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddce0d345---93671393800.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/96127375560.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/50347725665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sarah+hession+barristerPDF 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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 10372 bytes
SHA-256: 67b1e8958f36cd3568fa5c55e55b1b0666767b9288132ed1a925d10a290d1ee8
font_02_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16908 bytes
SHA-256: 3c0aba7f304dc0028f9a592bbedd1f129493e49c5d15e3ee0d97f90fb2af5cd7