Malicious PDF — malware analysis report

Static analysis result for SHA-256 205b765f24b3bcc8…

MALICIOUS

PDF

92.9 KB Created: 2021-07-06 21:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: defeb9056294c3fd02a158df3b2df5e9 SHA-1: 47eda6a08a065f21154683cfff70a55319b7d3b4 SHA-256: 205b765f24b3bcc8b58fa790540c52f2c04f732b3538fe51ebb27b9af63ee88c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d22d19fc5---gabumalifobuza.pdf
    • http://kasintorn.com/images/upload/files/70702430750.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/25736278845.pdf
    • http://web68s.com/upload/files/54237457480.pdf
    • https://autosaloncenter.com/uploads/file/zexonusugejikokurupalitot.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951f93659a6---57656694566.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/jasepidaliwagex.pdf
    • https://moto-trend.cz/public/files/fck/file/reruzirowal.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fd318d9d---legemodomus.pdf
    • https://ludifrance.fr/userfiles/file/nusebubajupurenakan.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a109547de7b---32916931511.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371a63325d---lodakaraduz.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9bc6b76481bf092d73b3ffe8cd6b5bb5/kolefituwip.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609457b6560dc---2758190580.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4ce6ad03---46172530057.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5d453c9a---dunusizutokekivusozegap.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/66aff5736c8ae93d535ee2b6cb7f4f8a/67003982180.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a0136995---28780623562.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4289473d81d1f2715a460cf16f3708f5/9488466163.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e94d56c93419b0abcd224b28b768539b/zoremoxibosuz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860601c117f---6879748336.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/vuxegam.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf58e76da---1885011748.pdf
    • http://omg.su/upload/File/zawasesajamodogomemon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cuss+word+insults
    • 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_off0000fe55.bin
7c02935a734c6fa0738a3c7ba42d360ca3cba46bda0b8e3e6ba88dbf44732cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 22684 bytes
font_01_sfnt_off000137aa.bin
9c3073c28d96bd3279c7d5b57feb29def8acc14cca61b30578c3c5b3cbdc7b0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 10164 bytes
font_02_sfnt_off00014e90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E90 16792 bytes