Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3dcbe6c2090c3b…

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0c646bff5a6d0f67447ba917efef832 SHA-1: f830f2a98f477958224cb3dbe11d4df9459a699d SHA-256: bd3dcbe6c2090c3be20947294a3d2c1c26963be871d97c901551e674e7893bfe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing pages or download further malware. The PDF structure itself is a link farm, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ruresept.ru/files/file/7521706166.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5d62ac3e---723023148.pdfIn PDF document text
    • http://fxlcd.com/upload/file/14431997470.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/lekadupebov.pdfIn PDF document text
    • http://klpa.net/userData/board/file/27981149103.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1615640ad8f58d---98359657627.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210904/file/bevazimazajap.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/60173813068.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613018655c3bd---powevenigaduj.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/kobokikosop.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ceb6641e2---40227063096.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/46504922162.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xupalaboniz.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/80656087085.pdfIn PDF document text
    • https://5uempat.com/contents/files/63671162400.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/63891714943.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/kodogobimuxixogapug.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36b8b7695f21e740c79f6d6889f8d931/vozoliwuxevabufodozutaju.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fefed.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/25335341238.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fff8bf601b1a2cc023b552422363ec5f/wafimerijifukilanomaniti.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/jawegisij.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/guborutekosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=universal+college+ecd+coursePDF link annotation
    • 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 17840 bytes
SHA-256: 7611ca179dd4e412de28771af82c2dada4ff04547ad5c30a2c5e83890c4c1cd1
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10620 bytes
SHA-256: 3c957530e8ac3b1d0a9f59a72dc4103af890c6ffaa202abd4651fcc07078ea14

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