Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af5343a9f74dcbd…

MALICIOUS

PDF

91.6 KB Created: 2021-06-07 09:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d1e68909766884c908260c121ddf8c6 SHA-1: 2b518c6bff0efcfe6d759968ca7234d273e4838b SHA-256: 2af5343a9f74dcbd5751a0bdeefcbcc25f1ecda112b5d7e7e015373737b9fae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, appears to be a lure related to teaching methods, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=what+are+the+different+methods+of+teaching
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a473cd858---fogaparajagevixawut.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b196eb3e17---pupofopukofudizaduzufifi.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d005814f2---likeguwotekitawetuvonufi.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677a35886---39892377383.pdf
    • https://bcbc3399.com/upload/files/gufuk.pdf
    • http://wami.cc/data/files/61334888195.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18794582e---salufulopoji.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4e02707c46713c8aaedabb5b6a24110b/48689564367.pdf
    • http://aeronautike.com/userfiles/file/lajujefitimigizap.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/89a539ca257e106406b1c997f5ed9926/sinamozu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be7e25ba---lisodipow.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7535050448---tinevuvojo.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17489614f---8238510034.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7de4b5be---bowezaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129c5.bin
e5b04f3404cca6f542397323b37db25e2f49e54eedaad808c73865b1f49d0716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 5416 bytes
font_01_sfnt_off00013c18.bin
3a87651c32238b19a56fb534a8068525c7ec50b69aacd5554f84440dacafe9d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 11148 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.