Malicious PDF — malware analysis report

Static analysis result for SHA-256 91631dfcb2f677c0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 11:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3532a47287d0aa9f833edb2ee3d8eeba SHA-1: ddd8c9a94daeff1aec7f952e7fccb4d1d4a7fab0 SHA-256: 91631dfcb2f677c0906870c42d529f532adae74355400e27394c86937a09f3e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are typical of malicious PDFs.

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://philabc.ru/uplcv?utm_term=android+record+screen+and+audio PDF link annotation
    • http://splogservice.ru/content/files/58161495214.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/baruvikupip.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/92044521463.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62280400133.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903210806.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630469689.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/wudotusuwakekifome.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/pinikazuxejixaguxaboxi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfeedd6fed---xabolufilepovu.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901061839.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/59107610239.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/rolijoju.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47655f4f5---gezekarojuzumolotabozoli.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc074a9a15---sekovi.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/50428423586.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/lawodopuzanidagagunuja.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vosesimikel.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/sisegivurolibugu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rewevejotojeterurawen.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/6999691156.pdfIn PDF document text
    • https://energooptima.hu/upload/File/77201732056.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf851e5542---28163746204.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e17b4553---luxitag.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c66cc2148---folusovesunowax.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021918228149921.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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10300 bytes
SHA-256: c608b111e50ecaad2ae64062870e5b3d16d26876d33d871a9707dd07ad2878ee
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 18056 bytes
SHA-256: a3cd270e1f9ff3ffb394b254e765e526630cc4b8f0cc0e38c1ab7519f490b9e0

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