Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff60a557d1bfe969…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 11:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebcf1d7782f9694b000b6d66ddd4f57d SHA-1: 1ef3caa5e2d24a17610c14368fd1161bbef2c36b SHA-256: ff60a557d1bfe9695e169c49f0128f0f213ab370b873ad4754193bb5d65ff130
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with 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 distribution through these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=stream2watch+live+soccer PDF link annotation
    • http://camelliafb.com/uploads/files/202109092054368745.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/bufixili.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/guwuzepepi.pdfIn PDF document text
    • https://partetesal.ir/data/file/wevikowigununifidi.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/vopojexovomijoxuxolekepi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109110904008537.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/2708487633.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80176340440.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/24159227627.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1c4730ab---49936573766.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/25584070148.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/71712410192.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tupuvepepuwavu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da7a21f036---69941723394.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c971bbccf6185f3695a93dc0e9f8db15/64332853789.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/raforuporaguvof.pdfIn PDF document text
    • http://aurora-c.jp/files/files/78036575901.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/suxuxaxivup.pdfIn PDF document text
    • http://mariancozma.com/_user/file/debemuwigarazajuxubila.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/98060571767.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/2933863646.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/79663891983.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 10736 bytes
SHA-256: d8f8c8fc8b76007f628caad1f7b23ed5fd9266d50925bd3e3306ce2d86276e37
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16092 bytes
SHA-256: a5f81b83fc696fa38e52c987f8edfd49560240dce21a0af96e947ff5acbcfe14
font_02_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1