Malicious PDF — malware analysis report

Static analysis result for SHA-256 4792a26f39c81d72…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 06:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2be3769b6f76a03e0042cc467eb8eabc SHA-1: 4570e00288ad35f2be2a0bfb9926c44599d4e60b SHA-256: 4792a26f39c81d7218b8e9479148260d6811b0c820a5d7bb7684a99d534124de
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=a+quiet+place+hd+movie+download PDF link annotation
    • https://austdoorcaocap.com/upload/files/14277247973.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/15224049780.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3084d86916785f9320ff03f956783f44/29103397124.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pitojozokunogor.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/90249710453.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148df3c0744a---97536959351.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161438e074da3e---madejonapi.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/47258756852.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/putajax.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/waluwutexudonujogorax.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wifutuzoxu.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/81338166293.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/donupidaxewiwobegi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1da48d0a2.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/11d0d8324f100c79be0c63690990ac1f/muwefegizus.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161369bd82210c---wukugunogo.pdfIn PDF document text
    • http://apothepharma.com/upload/files/83933759984.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282a34b18e---90555464998.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/kolujivegoxobena.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/dopid.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xupod.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/13559593438.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/debolanopila.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/91941168768.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 10888 bytes
SHA-256: 929cc51823c03ec36a7fd98ecad7677ca528acd98409442b6d15c8eaae32d925
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 15708 bytes
SHA-256: 97b11f780b0be05d2f6e5218b430f4a58740b14bbc0c019eeb33bdd4cfa56ba5

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