Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b35349de95c175…

MALICIOUS

PDF

138.8 KB Created: 2021-06-26 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a521a0dc8be799beb8f61fdb915b4d84 SHA-1: c12db9644ada0b094149106752471637aabd0b99 SHA-256: 87b35349de95c175dffb50c2aef2cb6f6374a2cfd6eb90e96f3a98876c58152b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_MFA_LURE' indicates the document attempts to harvest credentials by impersonating multi-factor authentication prompts. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution mechanism for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e760d6fc21---76887779283.pdf
    • http://koreanhotpot.com/uploads/files/pegosinavebebotobu.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/20384b641f5d77912cb4e2ec9aa4ba10/17913748070.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/e23ed66ec32dc4dd42b23436a7196112/22472497309.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cca3850adaf6b23da119a077af926949/xujogidulelixepidofunuxu.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4110e112---5273570998.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/fixorasix.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2e8481ed6b03c900bb0f9ba74b876700/zubuwitaregudavibotisije.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8b4716095f522a1ec14c1650a57600b8/nujopupogudedava.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2596d2a09a2c38b2c0d1d6345afd3334/daxonokuwixew.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/nu5l261hbndsdreh5a0mvcej7b/53883422502.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f68440c99---jovepefatimarolote.pdf
    • http://cnex.cc/images/blog//file/48666433039.pdf
    • http://alexhofford.com/temp/files/file/mepokafivobaxivaxubuv.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af35953383c---27468303197.pdf
    • https://maconlux.lu/userfiles/files/43383952841.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce85dc23618---vetijajuwupepifoko.pdf
    • http://superpart.com/files/rifatamop.pdf
    • http://www.contectrade.hu/fckfiles/file/vafubebegotevifiwow.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ac04b30---52501573723.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/64836552113.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k3ii0sfjp70sjaglcg826aikc0/kosujomaxozako.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69d308c54---33192413369.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/60cdbb1172d3155341ea2823c16f0aa4/pitubopusisose.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+game+ft+kendrick+lamar+the+city+mp3
    • 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
font_00_sfnt_off00018ad6.bin
5dc12345ce55d1d302f2c3888e4f30554845120e6ea49c6a32245db6d406aa72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD6 19048 bytes
font_01_sfnt_off0001bcca.bin
944bf08fef7012ffdb22d6199f18e9079f9fb4a91d76fa1e8d6c00ef2576ab19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCCA 7200 bytes
font_02_sfnt_off0001d522.bin
95c085107a6170c0d643c2cb5a5734254b37d1183a7b6081dc89031556550cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D522 11120 bytes
font_03_sfnt_off0001eeba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEBA 16792 bytes
font_04_sfnt_off000206cb.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x206CB 16144 bytes

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