Malicious PDF — malware analysis report

Static analysis result for SHA-256 52880e8e217104a7…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1beb47fbffff0a8acb0236479cf31b7 SHA-1: 34596046912a4b06dc2017f169a35c17eda932d7 SHA-256: 52880e8e217104a7e4ca573d2481f1acda3beb4d7a1ad526fd82f00a6cec4b05
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/uplcv?utm_term=surya+namaskar+mantra+english PDF link annotation
    • http://bftt.marketsearching.com/upload/files/41367751941.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bizexowalaxoxata.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/mafob.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kudobodarasaxusepilip.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/61885355242.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/fobadukemuzizesewonufi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161444a1575d21---nurimobaxovasojigugus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/joxovalutagekitewivirupo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/xogikaja.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/99651211602.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614950743407a---98046642503.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/vikuxutanemozupenuma.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nemewipa.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/13172964848.pdfIn PDF document text
    • https://dacola.com/upload/files/nevujapepivifilufagira.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jfjd3jsq6f3l2uhjn0d912dnq7/55438034478.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_off0000a8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 17140 bytes
SHA-256: b90beb3b74799cfddbd0bc5b0cb2b83ae9896ac826c510f0943e5fd4e5ebf4e8
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10816 bytes
SHA-256: 914a7c13cc4e24cd3d0128f2133ecd339c384386f3a5957dd61fa0479829a6ea
font_02_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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