Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61b428c41ce964c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 04:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba0791f420af8f033644e38f881dad13 SHA-1: 5c55b075048e733e3c374dd6e27153ca869c87d5 SHA-256: b61b428c41ce964cd57418728c11461b913c46bb4b68838499264a15bec06add
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable or compromised hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chikatere.com/Upload/files/70384880904.pdf In PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/dipuzutivolajudosezukukeg.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/weviforivupijifo.pdfIn PDF document text
    • http://vititanon.com/user_img/files/99237713462.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mirotajivozutan.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/31079157769.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/73269650646.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a2331d58---30915463575.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/jisuzozopamuno.pdfIn PDF document text
    • https://hinaweb.com/upload/file/27356291991.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tebibivedefowe.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/44089066936.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/daselarivofo.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/46877083899.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/faneru.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/dexikalukewapilivefap.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/xawupogazefore.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vaxaremesenobekew.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9b0d25ee---sujemasobilawa.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/tejuz.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gubupobilomojorapuvoso.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee09537ffa---69394981200.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/5540753559.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/jelaturon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=angels+and+demons+benny+hinn+pdf+downloadPDF 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_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 11068 bytes
SHA-256: 4629d208b1be5f41af035f871aa002b4bb0ff2b9691203514dda348b3a308102
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 17788 bytes
SHA-256: 1a504c085912b90231c3666afdba6afbcb5aa9c823ceced15362ed3b26000c5f

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