Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d487c27a001194…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 22:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17dd0bee25cb8f65151684204d1f2248 SHA-1: 9c08e5e9a644519cb9d331ba6d23bb53bf2c0c97 SHA-256: 39d487c27a0011947360693544c29b199daa0a75c50c09bc42d6f3c9245ff171
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous links to potentially compromised or disposable domains support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nizofosokajab.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1f518f76a8a38e968a46d2092d9d6233/rovaxiwazagesiwagakis.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/koxax.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/975a8514cc110f465f0eec2c7b089174/doredujonetemofiva.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a696155f---85498452841.pdfIn PDF document text
    • http://imoroz.by/upload/file/kowipegopozewal.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/sepivatososibifajusat.pdfIn PDF document text
    • http://alkanboya.com/files/file///sajaborarodowabap.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/5536255974.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/mokipe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b8399edc5629e51d67e92fa04be9333c/97781555273.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9c0db280---nabusanexoriruvisur.pdfIn PDF document text
    • https://everestart.com/images/stories/file/37439394199.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607af41fa2be5---sajetesad.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3rpvfpv2c6ttbbt4kcd9gl0j0g/nopitaxufu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d7c8134dfabe0808a06821f92c948867/24653595979.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ec0992ea---vezapisase.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/foketuvonepu.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/xuwifipunipowakulu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79eb98626---nunol.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vgps6ql10i57efca96lhh6ahd8/fadekajoraxikuzowutomamop.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797656574da---44653734966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=actividades+para+ense%C3%B1ar+el+abecedario+a+ni%C3%B1os+de+primaria+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_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 18352 bytes
SHA-256: d2520e7957411b7c2afb781af636e543f8684e93178f58f3819371154f10584c
font_02_sfnt_off00014be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE2 11176 bytes
SHA-256: 98f2d4e30dc14cf9507d8bdf793e260d52a05dba2d22dba58b3b115d61366394

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