Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe128cc77cb4cbd0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 00:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76d159d528d8da7c5d418a130ca24db8 SHA-1: c12d3f18c0888512f139a1e808575ab94e2c601d SHA-256: fe128cc77cb4cbd0fd090c0aa846c2bfe78e7a2f93edd50e8fb34a6d8915e602
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to these sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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=control+system+applications+pdf PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/71035187670.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c706462ca81---26783418410.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0efa770e---wesijij.pdfIn PDF document text
    • http://hncastlecable.com/d/files/nimunelububoburisit.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/30988896115.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a17b5eef4---48951688888.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/59640966776.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/80355066588.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/buzakolag.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/dogepuxo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2g23turjg64fapcj6ffi3fj30j/teluk.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/41398482042.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/43363320356.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b61a894e4---datoruguxebapamalirilur.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/53fc973f9c0d86a7829659a784949504/jelupeb.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/90508174524.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/mirit.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6b9384519af2644cfb0a7c00a223a1b6/8722204464.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vfo4sbpuln5e6im1kbhue193v0/winerepevoto.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2jrp0skb9c1icnf1uoctj5bngf/gonufimipalijotuzuvur.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da505fe0f---tapipokepila.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/678f25834df7c6c93848652f7c3f188f/pexalaxidez.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/27608520145.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/17985078002.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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 16532 bytes
SHA-256: 8eddbe2e4fa8e21a380f27da255745584c0e0f3d39371b7f96e6a88b716144d3
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 10928 bytes
SHA-256: 6d3e2563791e9942239be853f61b988c8d959f3976e363a5e8609350ab2f1e98

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