Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6d8152d78c2027…

MALICIOUS

PDF

76.4 KB Created: 2021-06-27 16:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45338cdb10ca62d1bb6d751152ee131b SHA-1: 10d44d9e9ac5296f31f1bd172f7d72e099c0070c SHA-256: 5b6d8152d78c202732bb285c8ba5f177f55060c2d8f2ea75bb83ba68d1c6a658
156 Risk Score

Malware Insights

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

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, directing users to multiple compromised WordPress upload sites, likely for phishing or malware distribution. The presence of numerous external URIs and the use of disposable hosting for link farms are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crysiq.ru/uplcv?utm_term=current+time+in+gulfport
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d776e1c6b3c---94572864237.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc53284fe---56355349198.pdf
    • http://rauvuonsach.com/images/uploads/files/silibesazowaludat.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/93048602777.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bg1f7a564b1uv10pnttpa5m59t/72396969534.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/79678227757.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3af0764eb---kixizukaretufaf.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bf0ed49feae1066b69e578befb8c3b1e/kiwagan.pdf
    • http://provia-events.de/pics/fotos/1/file/vipiwebetu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8889teai0ulcqo65769dfkjkq3/kezodaginemovasesomako.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adee671aafb---xibujaketaluvebare.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc23c2b18---33129196983.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c286b7231---tadibilikerominaxano.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41235a613e---95462874549.pdf
    • http://whalesart.com/uploadfile/file///2021051618563944.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ppkgnot01eq2v1u81aej374a0m/96968137421.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b85b6decb03f15d5f192fbf5008f2e4d/24016458089.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/00416d98c94146660361bd27a4314d7b/fafutenepamuruzo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080623c9f44d---zopoj.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/488126493178054dfd7d04355434e148/tasanuginelolikepisug.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/tugukusevufivi.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/819f5133e80920e94503faa736d8cd8a/nubarejexutax.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a0a5f0abb6930335818490668ba326ee/633680601.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4ae2b159---rebakiwanunofowulepozu.pdf
    • http://asfus.net/virgsurv/userfiles/file/jalukigiwufen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e5.bin
905d767b63ca86920b79f40c1c2ed44a08d2f4bf11d30c699a3f1bfc9a301a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 16808 bytes
font_01_sfnt_off0000f48d.bin
35ec75e37fe281a5744eec3bc27898b3d0182f7a07222287989fcadb4d996ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10500 bytes
font_02_sfnt_off00010c61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16792 bytes

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