Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbd4b04e3451542…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 01:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a7f785fa0aab11751adb87428dce3b7 SHA-1: 6ef2c9c7a4a1f5b21851fb65a12960e6a0197eca SHA-256: ffbd4b04e34515421ff4b74795a25a3ba3d363ceb474beaf22df846ccf70e8a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's likely a lure document rather than containing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://antonioruizabogados.es/userfiles/file/27149422089.pdf In PDF document text
    • http://tbff-bygg.se/img/files/59793592465.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902151903_MzIzNzU0ODA3MQ==.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/goxabawiwexunugo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/46c5a34db99119d39170ca8d79fa3886/sekejex.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/51558627519.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbc9a1b23---90443555570.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/lulokuw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa9cbe4a9---57417865189.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109021657116085.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/duvimikobeda.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630543941/files/firetomenedarilubisizoka.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/23538874320.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/45224805860.pdfIn PDF document text
    • http://philboyd.com/vebezonizawowiti.pdfIn PDF document text
    • http://dentistturkey.com/image/files/94690429747.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c77c52f9---wuxaramesabilirukewof.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jibabogadopuvodad.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fokanikawazogoxozobibi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4321e4738---93923945791.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b00f38091---67015243095.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/rixeputuvafuritirukamoja.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/28034268336.pdfIn PDF document text
    • http://safetruck.gr/images/file/tozulegiganoxowa.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/60579132838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=stick+fight+unblockedPDF 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 17660 bytes
SHA-256: 9b5229a39b300109e87dea75142cd81f35cb9f74c4a8e329c40f15f2e6250d40
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10732 bytes
SHA-256: a0e9eca85ebcdced8a5b023b936954773afa1202d5bb8555d58cc467be126863

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