Malicious PDF — malware analysis report

Static analysis result for SHA-256 598c0899241130af…

MALICIOUS

PDF

75.8 KB Created: 2021-09-25 21:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b646b09dd906a1ef9b9c5d383e408ee SHA-1: 8d0d1e4520ce03ba1f07acdff2f5b51c274e0e87 SHA-256: 598c0899241130af563b8b8791f822fa3e0bc5761838d40776d5b4e5735b3944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=how+do+i+change+the+default+print+settings+on+a+pdf PDF link annotation
    • https://euroroma-bg.org/files/file/fotog.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/fotawularelufip.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614071ed5d44c---pagidimotefedusil.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tupomipawajovogijopofun.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sikovuxaguzuse.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tawevita.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f991c651012d15e060191d60276775aa/65298895943.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vipaxivafotofuwifasabap.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/57948659871.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/gotufam.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/rufileruwazirur.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/71368138743.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fijaronudizoravo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40009728893.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/28304985561.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/63426265509.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/28519726767.pdfIn PDF document text
    • https://kueapem.com/contents/files/97460358398.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339b7c1d906---44713384823.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a8a877fc---32333298164.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d10166ad1---11612820343.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/69591462071.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3dccfa02a83400dcab9edbcce8d08a98/86767997421.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/menupivubufemavosuforeru.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_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 18408 bytes
SHA-256: 22d1206df716fca51b924149349e19a9f471105bbd5b8aaf25268421a60c975d
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 11076 bytes
SHA-256: 5af503bfd428ee7cc89d73d2b3a38de62ad5ca58d11d80ecc51a09b1cab52fdf
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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