Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afaf33443150ca8…

MALICIOUS

PDF

96.9 KB Created: 2021-09-07 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b874c82a8d1ea76cf10b90537121a50 SHA-1: cc60e7f0a6cdd528259b519a7be1e92b371d0456 SHA-256: 8afaf33443150ca8347325047517d7243b4d4407e09bd4ca9eab3d3512306531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://manajrgvaaradhi.com/cms-uploads/files/68336438468.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96aa2732c---95470449552.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45500273509.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/witade.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1326add2ef49ed74d4cb6948812460c6/21866881513.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/3599480999.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/7312449130.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/64605206867.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806ada7625b---7274803822.pdfIn PDF document text
    • http://charivne.info/images/file/lawawebawagijerumoluba.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/316266f385ded6e382753d9f8c15a58b/xekegogamirosisomox.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f847be8d6b---jepetewefopusijotubumade.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kodazemoxodebafige.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/gesutudupesetes.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/37162425988.pdfIn PDF document text
    • http://ashioke.com/images/library/File/juvuku.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/rosokowar.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766d8ff2b86---36333417019.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/19031223516.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/514cd60bcfcfae8fc0136efdd17a344f/kitasuwuzenidekeditegoden.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c3e064d78---seliporom.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f9963556---rijipetat.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/66987560240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hindu+religion+tamil+pdfPDF 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_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 20184 bytes
SHA-256: f2894360a4443b1f260b505047f093b9b1bc011fa8933af0cc4e0ba624b6c45e
font_01_sfnt_off00014578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8F 10764 bytes
SHA-256: 988d7a5322b08dba5af5517eaaa6795b04b7690711ed1a6a45326cb4a53b7f2c

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