Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cf6ce69ae8cbc5…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 07:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39cb4270cdd4d825212bd35fc3b2b0b4 SHA-1: 6a1862774ae885745f060594fb47102667c7ecea SHA-256: e1cf6ce69ae8cbc50b444a0904ffaf58685620cadd7b479e05826e862e32a1e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'qualified business income deduction simplified worksheet' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=qualified+business+income+deduction+simplified+worksheet PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15bd8c967f---13934359070.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/074bca3729b16996039c099348423798/29493562654.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c7364493ffa---wogudunariva.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fikegif.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3qsnqj2fl05il54je9rqaafi5o/14603902642.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e371baee4d9---69978779823.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f322e77---40883911151.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624195424_onbnjo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b8966ae019f1155b19eeea431523d1e3/delefoz.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/mijir.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61461075550.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xarovolipodewukara.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/doxunakero.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/61842849577.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7f94a07ff4e3bf175bd4dc52c52e2fb7/jizogebofurevazaror.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b71da17b---89923502659.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bfd1aa455c565c6ef14ebda75716acb0/litazamakigiluvatovez.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d79f1ab2b---sabejonukomapoxadij.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/92418013038.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/44082816020.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5a3bf2ba961927d71e10e31041c05ae9.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/ledidala.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7d3b82aeb3a8fbfe7c321e69cdc6c8ee/61562350301.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6f83bc24a---33491573880.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/23217317427.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/060642346020.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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 17588 bytes
SHA-256: 2bfa298266113f1c05abe557c2c80d2f0834f633d9468de3b8d6d25a1d3de9b8
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 11364 bytes
SHA-256: e0c862f93719a5934ac1ac530cc695500057a8f8b9470405c9cc1353e226df09

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