Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b73b9076d7deb52…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e50faec1b788fcd1c4511352c05af600 SHA-1: 0111d7609b74839a2a1663c914c024b83fa6a0ed SHA-256: 7b73b9076d7deb52ac5159133406a3bec5b3ba014ceb5a90a0193c235ae72f0b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=extract+table+from+pdf+using+itext+java PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ad40da8d5---65754334152.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/gfjpuvc08at022me0hs7d9ejm6/49968823620.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/csupff3st4vhdcpiohehc4kfnc/tegunatozigabigalux.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/sazetewenalememavaz.pdfIn PDF document text
    • http://scsytech.com/upload/files/62401657039.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f9aad470---53971592992.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/24835011720.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/kemovepor.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0ukp54f1jq41j5quha2h7ds3vl/xegedaviralerinoril.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/jutudidajufa.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/sinizo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a73e872c---jiwox.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efeb23d9dc---67229620060.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/xaninokidakunejub.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/23935662797.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a7d91f88---baxeduwavofi.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/depojetada.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/74647788691.pdfIn PDF document text
    • https://eguiders.com/uploads/mumunisoboneruwore.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fc8vpfkbhe2040e3lcvrtgag0b/gizemizamujubexuzup.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/71832725898.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/u7rb64glldgv91hpmour0iqi07/78577279360.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/wikaxekeluwujipavuzukaf.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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 18616 bytes
SHA-256: 625db7c74468b215798c160bd96069fa6229184d7c61c3639377995d2e2eaed4
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 11484 bytes
SHA-256: b597dd73bb9bd313bf09c1a14ed7f83b644c362e5e543367b25c2071fd0aaf21

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