Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f14bee1de881edf…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 09ae926b228d62c988ce026d73bcfd58 SHA-1: e754ad213496c29b4a43346f16aa0fe38e509690 SHA-256: 0f14bee1de881edf3b695d680c6937e919414cd9557289a3e711b27ab8063cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fdf743d72---40966258648.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2675b878e---susopiwumafad.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/427ju6f1jeom2ent4vf309q5v1/xusafelesawavoxobonodi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774018a7368---42208946865.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2503c4e356473b5cc3dcf531c0cee59f/1878370939.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fd31d9279b65b6d611801e64f2b380d/12875997721.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/dozukikuxove.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/56253782295.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/mofizafogakigubu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737147049a6---jewot.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4dd2b4a3b6afbb57738fc932d77de54f/remawujowajovagotosesit.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8741e576b---42308455857.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/89835133526.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea778d544---kerapagafibubinonidepes.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/13408983989.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/80e13d54abeeda49656c7bd17c171269/3257959841.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a7981a7efb986c9152afbdb9fac25509/9639681177.pdfIn PDF document text
    • http://alkanboya.com/files/file///80342807097.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/da28e2c912bb0479991e44bec2143b65/88550304559.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jh4nci4mf0us57sfmhkeko2knq/20639822079.pdfIn PDF document text
    • http://altinay-law.com/images/file/75757415333.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jimusubanufajabuvodubev.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d05920f629856bd096a5880fc184cc35/fafidusal.pdfIn PDF document text
    • https://stopserv.ru/files/file/xemuseli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=500+square+feet+apartment+layoutPDF 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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10948 bytes
SHA-256: 834fee5f79acada9a55498113c97044d77ccdc39c75f807c1ddc8e91ae8b7d67
font_01_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 17108 bytes
SHA-256: 246d914154c24b440a51fdc5ae48f8418fc5af0072f5d47e034675daeee24038
font_02_sfnt_off000138c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1