Malicious PDF — malware analysis report

Static analysis result for SHA-256 6454b28103142fdc…

MALICIOUS

PDF

77.0 KB Created: 2021-06-10 16:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 578bbd62294c7f462857f50dbecf8d2c SHA-1: 21a905f4649a1f5858402fee6967b916bb19869c SHA-256: 6454b28103142fdc28d09c61ddac90caf622d920f118914f8a4e387a28676ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. The file is detected by ClamAV as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=kendrick+lamar+to+pimp+a+butterfly+download+zip PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b653e1c138d---dinozixufelugarokobawa.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ir6amqshbi2bv05ahj6fvu4nnj/gaduvixo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/58247767879.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/regavefulalazun.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/2926827237.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4cd0724e---21725903509.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00aaf8687e---258632439.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82eb180a7---zozodosutu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gapilonolobibotatakugegum.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f058232e0b9a7ea3ab055f84e1de5078/kurazanifow.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb5db875c---10906296892.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jizikumat.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2ce44852---kisunivasuwevutiwiwapuwix.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad3d28cff---xanarazibawogasud.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ca60acb37bc1e4eacb383668db978cb1/80879632642.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/jiu577t2gcej81br2idagb74ib/likitofomirazepaz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a6a200217a6e111a673c8647817b8b22/51831495485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5424 bytes
SHA-256: a80b43da8509f477695f693a61ca825ad641f0a4375fe8b6248a2810f781ab47
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 11220 bytes
SHA-256: 8e2284d12810dd0a4403b61b2240fad183f9471581381ddfe93e5dc36e962e90
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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