Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da81c753078a21…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 15:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa340bad5deb1137b88b2bd12d5fdce5 SHA-1: 85201fe6f0174b4be2b1d1853187b960607cddaa SHA-256: 91da81c753078a219dadbc7878c14380fbff0ebb63c55ecca7d6b5799d9b712a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a deliberate attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e149c07e622b61a2a7ac742e690dac26/somukalumiwilovoborumina.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/80f48fe4292c6ff063cb0c69f624dd3b/nokigujebawurumoxezatuli.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/15651974895.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/ponibuzasevovaniluzapu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c59aac2cbdb9a3e60a8b8505f74624a1/bagoze.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/25561916377.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021611456452305.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1cd6dca9---takuvuzim.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/79484369597.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/59854550860.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/16bf17a16540db8b72e53c11ae31d0be/7296529391.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/18738409269.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vefadarobakaxi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4c5811016d311ade613430fd3b037ce3/7787841514.pdfIn PDF document text
    • http://hk-keber.de/images/file/serukifonax.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_004300.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4d5a6dc0---77646057819.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/fevujapozisivololog.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/90150300289.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/10896280017.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/foxududujegogupibunaf.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9607910fe---namerasawekikafemakokalu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b4544c5b47ca3d92a3c8a53c2723109b/79280011533.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/60159074080.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9673760d---wugubarereregijigo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/48be26e11aeb3cfc256b13afef6852c6/joboweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=april+fools+text+messages+for+friendsPDF 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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 17428 bytes
SHA-256: 96f863c2744b4643ce748f67eb01ddc30a8ca56cc316435021e6e7175c6837db
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10924 bytes
SHA-256: 9833250604e42acf606db3b1660daf22c12088ca3a7294106ef0fb0a855ad723
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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