Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c03e7a93396870…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4fa6ce75e5bbaee62e73abf8f9c1e2ee SHA-1: 4437b31bf2a0a576d4d3ec2f4057e56684cb9449 SHA-256: 71c03e7a933968709ba3137dd692ad2a5d8fb3ba3af040f7d9641f4bd9f253e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the 'malicious' verdict strongly indicate an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=aplikasi+download+drama+korea+subtitle+indonesia+di+android PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23711307e04401f1fa512851221a458e/52393311673.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vukig.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/pupaxatitigufelifurabiwi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/55080337207.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/18805738077.pdfIn PDF document text
    • https://fototipia.hu/files/files/65574288065.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/lezuvofovuwekanu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138472106b16---xinulesowi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c149875498---7985791938.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109050318255398.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/13598819152.pdfIn PDF document text
    • http://congluc.com/upload/files/welowomepexezanopugukofi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/2971531004.pdfIn PDF document text
    • https://petribax.com/userfiles/file/49580895425.pdfIn PDF document text
    • http://bushurov.ru/images/files/27606432488.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/nuxekoguwukevilapitoferus.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dasojineru.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vesijamulitupigufodamaxip.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/saxokuvideda.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/denigoregedijozox.pdfIn PDF document text
    • http://robbes.nl/media/files/19151193798.pdfIn PDF document text
    • http://staropolski.net/Upload/file/pukozasalud.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/55710528724.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/97702672261.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210912164421.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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 18160 bytes
SHA-256: cefdb3d1f264d7ccb893666a769ab6f047dee4c6622bdcfed7ab4e76674d1386
font_01_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10952 bytes
SHA-256: 002973e7735fe415d1e1ecf37debdbab332587c2f7860c0eb264221f36e2cdb2
font_02_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1