Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb97e2c81aec91f…

MALICIOUS

PDF

76.5 KB Created: 2021-06-29 00:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba0ae29d0b5bb392b859786be86f7ef9 SHA-1: eacc89875720a4cababc6c27147b29b57c920ec1 SHA-256: ecb97e2c81aec91f459e19b07d425aba1c71b8afe2a3550fc7505f5f5fa635d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings and numerous URLs provide sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb983fa14c8---kabilemido.pdf In PDF document text
    • http://sanphamhanquocymy.com/uploads/files/8855827798.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300a0bd5fe.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/97517697863.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bfj8rpn73vhhgj99onoiihmjib/76787526294.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vabedisidavokob.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef8b73f3c0ee3be32ad2ddf9732bdbcc/dabunikagugeta.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988cb48a4b2---duletotowojilopufe.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/29480620791.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/90459317699.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2ocdvrav8rgeeosa7a28mfto6b/86393133386.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e735376b---1273785213.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160908fdf2d364---vudowiloxivi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017cdd7d2e---wapigepurajubakufopinafo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbfndh8l9fe4o52is1kq6bpnf4/felitidudux.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7840ce9121---47214862956.pdfIn PDF document text
    • http://wernitznigg.at/files/vizuvukadowerexajogi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/28584633977.pdfIn PDF document text
    • http://web68s.com/upload/files/56135987934.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a15449ee163---rimekemibabituwenewazudu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/72021135711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=examples+of+the+trinity+in+the+biblePDF 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_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 16796 bytes
SHA-256: 0359e5fee4652965a7e2b5da622ecb2c310c3566d4984f9d6b4dc15a8f6350b1
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10960 bytes
SHA-256: 87854d185c8bbe8b9531a371953418124abe3ee191e7222ed4795d61f1ced90d

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