Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4465955c352eeb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7cb1cfc8b310c6160c0c9306325ccc8 SHA-1: 8814409159c8923a900e74f25503eabb2d457de4 SHA-256: 4d4465955c352eeb9a62f555af6a59c3dc6b1f851f27f6f6459717f887baf6ed
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement or potentially lure users with promises of free software, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://laborke.ru/uplcv?utm_term=free+gta+v+download+for+android PDF link annotation
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/83636062619.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b865dc6386---vixutepemilofimuso.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/fapopevaj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137696067069---69429378938.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tanemuganekikujisof.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139480547112---laduzumitikiluforuwovin.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/52044261972.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/fikuxixidenusinisivuwegal.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/redavamasatafizupuladina.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gidas.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/35206139883.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/vokonudufuf.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8552012546.pdfIn PDF document text
    • https://termofriz.rs/files/gagofeguziwix.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e1a47672a188ec6a090fd2a1629e1d29/kotaresebinapigelalabofu.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/wepuguvamaxomiban.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/jimepewetit.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/95014076649.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/bazetu.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090814053265.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631577678.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/40870085837.pdfIn PDF document text
    • https://anup.bo/images/files/nokafivaritaziniforakaj.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tekuso.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210919033141.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/rumawudejovu.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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10492 bytes
SHA-256: 05918967399bb14aa8414b4ad6bb927eed4c19a69aa3f4aa8431cee8dda2287a
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 17720 bytes
SHA-256: 5a424207f3017e731a942414559a0b1c34f215429eb8e8d276801b05e6dbea45
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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