Malicious PDF — malware analysis report

Static analysis result for SHA-256 46706a12b1bf7c78…

MALICIOUS

PDF

102.8 KB Created: 2021-06-27 15:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: affc735131353869b0d89b52032901f7 SHA-1: 8516da7cbac27a37fdd4e60077424eb138a7defe SHA-256: 46706a12b1bf7c786aca525c2141cc9b9bc6a85fa1e9bfc352bcac7eb271c6e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to external, potentially malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://crewmak.ru/uplcv?utm_term=poikilotherms+meaning+in+english
    • https://1877painters.com/FCKeditor/file/kovalolupuvaxajesin.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee926a93c---69850615239.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b86f89c0e---1474620269.pdf
    • https://p99.tw/pro_pic/files/notedubapilo.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a6ae7b33d83---kawavitasikiledasuti.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d1f5012f80ff156e42f9d3aaa4c4653/32298168883.pdf
    • http://ipmarketing.net/userfiles/file/fovazuba.pdf
    • http://yanarfabrics.com/firma/files/defunojenavamiraduzi.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kusulefunivisulezariwirij.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/s7cdetj5jp7g7gjdjco11shs60/33718495822.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d17fbc7ebe6f68307d3546878417f1e0/55601623065.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/hdgm1qnpi3k0odho8lmgl0be4i/dilafanob.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd6fd4eabf2877abb42093a618a14d25/zozalatatiwejapegisalije.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/87b0hsrlr72nqpbkfqv7hukdk5/xogoluk.pdf
    • http://analogsys.com/uploaded/file/1815209800608da3b7726bd.pdf
    • https://wagaskar.com/media/91414713062.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/16bf2fbb843c1b521c9fd9f825bc384e/56769251456.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/189b72f91669b2ab180ed92d8ccd51d6/bevudipesivikagodesuto.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/73773c59ab26447a28ff5a2bee2e974e/gekawonemu.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cfa1b192---88251202099.pdf
    • http://remont-elektro.eu/archiv/file/4074967001.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7vqtbdev6ccocnfs5j056qq7p3/65258624010.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/04554eeca46fdad2a64d4f0affd3cddf/78154057037.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f104.bin
f5a9e269a9abf7bc736e338aff801b746ab9a89ba6e52702b19b020b26c620cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF104 23496 bytes
font_01_sfnt_off000119ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16792 bytes
font_02_sfnt_off000131b8.bin
97d5ee1047625f7fbc581df8f55bdb734da87a07b799bba9bb73b3cf9c0b6026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 2212 bytes
font_03_sfnt_off00013ba2.bin
a9e4745a1e3afe318e25bfdc3eeb58538e939e2627d6c490fc89fdfbc752ab70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 10648 bytes
font_04_sfnt_off000153da.bin
73a3edec0efa3202c86a8c7ee05b264a96ccd039af14e18f0b623abeafef299d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153DA 22788 bytes

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