Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fb6f3e0a32d9f2…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 23:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d16509f5647dff6caa9db2632a2432a2 SHA-1: 81402f37b7deb06aa8bd959ca4293ed5536130e6 SHA-256: f3fb6f3e0a32d9f25e1b0d9ef74e903b8188824dd344f8b7763319f6dcabd9f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=year+2+mental+maths+test+pdf PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/01dtvgreqios8l8q5d78vpn4k5/65986093382.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/71755399228.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/mowominitunid.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/86141123208.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/livupufajoki.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/96309837810.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aaa6c1367---fazafipolofezafox.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/21757869197.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f0e00921d3d02b0111d8cc6add1fb18e/suzinaje.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/tutaxirowu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/75549652734.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3db812afb---wubufekewivor.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vetosifetupewexinefuwebal.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0a5cd718---wunumuxegugugig.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/mivovoped.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/k8ek55clree91fhgd2d9venlj5/bisokozufesu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/ruvimepezopedijepojuzer.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/c0l1g7v1c0kjl9ql1ipdie3ocq/57897524840.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/13826460362.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6850980b8---66459528429.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c97321a4ab673be9c0be80a68bfeaf06/55100393625.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mixazisuleziruvokuxinife.pdfIn PDF document text
    • http://chipgene.com/image/files/20210810_162119.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/58226771463.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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10656 bytes
SHA-256: 90cda4892c29836f1fd6149e7295637d17c898f28cd1b510027ec5a343e29e7e
font_02_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16068 bytes
SHA-256: b61206fd31e66eb0e205b240f07c839bf47cfd87254bb6dffb8aea895ecf5822

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