Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c350b2212a459e…

MALICIOUS

PDF

73.7 KB Created: 2021-08-26 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49c44d2140aad940bb248c6fe1793214 SHA-1: 0c714a811a76ec11e28af2a8cc9917a002185e65 SHA-256: d5c350b2212a459e68343cbf9bb1eeec426a04b73b5354f83c81ee289b4208f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=halftime+amy+winehouse PDF link annotation
    • http://ankamet.com/userfiles/file/19326173222.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2286eef22d5160761594c7ebfa0a056c/42894373460.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/713ec84dbfea098139ec66f21269db66/zikodoripe.pdfIn PDF document text
    • http://15881588.com/ckupload/files/davimawukaxetaf.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sinabarefitavexoraxaxige.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/jopis.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48842219126.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/fesofuliviganomo.pdfIn PDF document text
    • http://cochu.net/resimler/files/22465389439.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b47adbe9ebb---vozalufexobute.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/69836837927.pdfIn PDF document text
    • http://someteme.com/archivos/_20210701230303.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/93620924171.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e32414c98c9---34081180692.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/210516105640325236r7btop22kglg.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c214f066---39549754215.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b1b63c45---wiwilozevagaxexevodovag.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/65754371913.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/86042516297.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejotetijerufi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772707c8b7c---widajidijuguxivusose.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/32402214198.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb59fe8bf5b2292a2acfa7abf91129c9/nilelibikubomikenasapi.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_off0000bea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 10668 bytes
SHA-256: ad4b0576c20af6a7349a836fe13ab2ed68245c60febd7444b398f1bd02f5bbe0
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16172 bytes
SHA-256: 1837ec20be34e2563a2c633014b81c4791ed18760289c091310af6c085f01829
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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