Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef8ccc54bea03b5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 02:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3fd3fe18550d03aac4781b45bf40899 SHA-1: 5bb5ebe6963af2dc2b88fa740a8111ea3b18fe9b SHA-256: 7ef8ccc54bea03b5743da696259fe8e8af454a6be466cc93c0f3f145fd7b1bb8
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 of which host other PDF files, indicating a link farm designed to distribute malicious content. Heuristics suggest this is a phishing attempt or a distribution point for malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://soosekszer.hu/upload/files/nukasedupakevotoze.pdf In PDF document text
    • https://xylemleads.com/userfiles/file/welidikubifotukujolawe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/30c8f0e9ae36a348db6b09359df1194b/denemetevenolo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b5db50a8---fatifugezo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9432fe9e---30725508181.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zawakobabitunuwisox.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///28334169638.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076161e44b90---60736240636.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/koxamafimerunomaf.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5b74c409e19abb89a21de56aa9fc973d/vuwizi.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/pebafisapen.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/87977709234.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56304250202.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/4718717359.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/28794905788.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/57223827911.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sugufajexa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb58d899c0---51729379559.pdfIn PDF document text
    • http://nakatka.com/files/file/44851537732.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pugidume.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/luwevedonevopi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af093c982---mugegagevinax.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/58030187269.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/40587380248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hooked+book+pdf+drivePDF 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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 10200 bytes
SHA-256: 0eaf4985e8be8b7ae6f3d42d590e51a916394ac08cde2fdf267c748d46d8c80d
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 18280 bytes
SHA-256: 569b1bfd5041a8047986e2d52d22cc55f12e12d09cf0558c29b167b8b1d10aeb

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