Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef76e5a7400ab18…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 16:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbdacd8a77b4d811505f79ffdea1b9d9 SHA-1: 8156f9b96b5a1f90e82ed4b4e8fa3812642e1dee SHA-256: 7ef76e5a7400ab180c783c1800e4738277e6edf73d5558d1beac26ed8d781969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ClamAV as malicious, with a high ML score. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=central+cabinet+ministers+2019+pdf+in+telugu PDF link annotation
    • http://suliaok.com/v15/Upload/file/20219215295858.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a04350c3db564051ccefe4153c592121/3367175297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6698311f---lixikorajemazes.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/radu8er4ifuhhf02q23o5k3mk9/46058632468.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7a2cca4da91063e51bea69893329a82f/15729327867.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5eadb8881d58555ceff035a91671e62b/4037864238.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/fuvebifokodabavogaxexudew.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/25243065816.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16117b7e986440---57705971039.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/37d85a93840abe40387d152d5e7e9e52/pevokexofupom.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071878b2384d---wagodosojos.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/17490820373.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/59620682442.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/derudinotegedajoxuw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd205487b1---fapobajudo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81137910578.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99d62aba6ff946bb491ce244b3dfac86/bitututoxatov.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/lurodurebalabalibunamepas.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/24600650005.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5964_20210526190702.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/20926856018.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ajp76d5n3op7qs73p1jf10un0s/jajopijuxa.pdfIn PDF document text
    • http://vecsecity.info/editor_up/binomidibote.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 17316 bytes
SHA-256: 1dbef395d498200fa3cf3155862022899f4794f08147540cb1c6f7c35edfaee6
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 11576 bytes
SHA-256: b6049311155bcd07e53ad6bc58ccf4240165e38dfb105cb1ecbb466a3b74270d

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