Malicious PDF — malware analysis report

Static analysis result for SHA-256 947aa4bbee7455f5…

MALICIOUS

PDF

99.7 KB Created: 2021-09-02 14:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4202e6f7f3598000f47b650f40cb2e02 SHA-1: cba607c15a18722d45e0f85d9b6c7d112c149381 SHA-256: 947aa4bbee7455f5f19b97c882a269fb31c78a7f5b2884a0e8d1ea05ce276506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pagodatalk.com/_UploadFile/Images/file/natiwatiwejupipup.pdf In PDF document text
    • https://detmers-kontejner.hr/files/raluremelekebuzuzadejutit.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/eb772e62644bf25767e4c582e100258c/50231454877.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf947cdba35---93932503619.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xifuzajafufozurud.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/fovuratoraxewusuwu.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-10/20210710185230272918.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95758125226.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161292511a5677---wibos.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda563bc04---6073810691.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/65408772594.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606c0cd4e---59665950923.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f7a72c4f46e251773e240366f46efe7b/mofezodobawu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/44023581615.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210707210942-17371997442.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/subofurejop.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uv8r6ln33bdqvkvrvf08gskelf/famebafemumojomufunusa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8c2b1e7---vojajasowa.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vusorowazowukozudezow.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7o3t95jmbgetoa1fgv0rib37og/tutuvus.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070621311773499.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/77308358003.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075f51ba4cb3---tixowawewek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=history+book+pdf+class+11PDF 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_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 10768 bytes
SHA-256: 78c6c8f06a27cbc6e9ec985db8855172319b898abfed64e4a094dd3350f7f32d
font_01_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 18712 bytes
SHA-256: 7264f6e83409467cd5b5ccd465c1353a1663dccd4cb35218b7e285bec636c9ec
font_02_sfnt_off000169d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1