Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdf315a926a2825…

MALICIOUS

PDF

87.0 KB Created: 2021-06-17 06:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a1f949b6d048f15000318aa94aebdfac SHA-1: cd38b2a2f7a61ef0ab877561aa78e34b6af574c5 SHA-256: 4bdf315a926a28256bdb600cca973b8bc523b0717479db72e640af76fc8ca1d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=90s+music+pub+quiz PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e4d622a0bd1142bb4177a7add9b8cae9/71097796540.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469c2b9a76---64299933243.pdfIn PDF document text
    • http://stattus.com/assets/file/gixitezaxuminemiteturinof.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/fibitozemugaxev.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/vazejetodumoninulab.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a719f7be---kapexamu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/836823506.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e038db6745---puluvaluzatiwiri.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nimaxolilidebalebufoxa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2898fa4eca---bisituforon.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/fovipibubapevoseru.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cd3aab1e---xanorimexeduxugabeje.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2f187f1---wakowebalidowafufazab.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5lc4jsllj8qgt36u80dv1b8s9q/jukifita.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sabiloketa.pdfIn PDF document text
    • https://bnovum.hu/downloads/vigaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 4728 bytes
SHA-256: 7a1a49c6dd3ea56d7889cc58642f22fc3a5f3960fc4f6f53d7dd63f3ccf94cf3
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 6612 bytes
SHA-256: e1035b1e063d6390b2fa8019752635daca04d013c2e8ac2dbac41b118f3145de
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 12168 bytes
SHA-256: 0e3b7806d116315d064a78caeb3541eef2fdaebd94c5be4dde04bc2f06dbc896
font_03_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333