Malicious PDF — malware analysis report

Static analysis result for SHA-256 1993c6dc6f1d3a60…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33f3eb61a38e58a56de2814bca96ad9c SHA-1: f7ed1add25f4a2c636883953e5000feb074043c2 SHA-256: 1993c6dc6f1d3a60150f350b9d7cff35781f3b75930fc9f9d86a23ff6c4af174
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these external URLs, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ketchas.ru/uplcv?utm_term=balistica+pdf+unam PDF link annotation
    • http://imcborivali.org/userfiles/file/72055309756.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kefamufupogepiboropizoxor.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dusaw.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81780bc8d702e4af9493aaceb1b43c2e/67484737726.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/r68s3i4ecj3e34ep6t69bvh087/65085267638.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/10462085050.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/8vtfqct0lopk1l1vi3guju4kuk/jekivesedagelava.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kidijowejoferovafusu.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/minal.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/56088230955.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/841347c722ad3508ddeb0cc0ce6cd5d5/gazuxiroxuma.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/kawamefedamudetop.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a514b2055---11444132507.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5257a99da---21145585980.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/58462662744.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4adc880ffe8054b66da78f368560bbc8/rojunobabetin.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/45146374119.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ajhlefbprpkrb700lg4l9039u2/wowawevagatarubudufiw.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/21996484758.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8d0595c1bd5be936e5f5a311d475890b/suvofugutesedawibazanu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/11933178592.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076051d03fda---sivijibo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/66504597374.pdfIn PDF document text
    • https://ultralloy.net/upload/files/73611865937.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/juvexigejezek.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/netemutubonukijez.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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 18268 bytes
SHA-256: 82bd9254c092be870282bcf91cc02ac6b4cb7cb3b0066d9744656affec22f9d8
font_01_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 10580 bytes
SHA-256: a5dd2a472e57a79532a6f6d7355466671e457c6371048bdaa277f26e43a326c0

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