Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ee4df5c5857180…

MALICIOUS

PDF

85.0 KB Created: 2021-08-09 20:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f865f306918a4c3b61194fdcb65fa3f4 SHA-1: 8c40176083f3c1f7a06770969643ec486774ae75 SHA-256: 77ee4df5c5857180dfd8d76d89c453819f26757cdbde18403779873da1cf8317
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a primary function of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://schnauzermountainminiatures.com/clients/17729/File/84652888978.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77c11561f8---ruden.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/55435603167.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87191f2861a36aa09ef673ce06f9549c/ratigekilitaxo.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/64769171053.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/raroxedifesawoxa.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/90835482437.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/46701c193f2a6998b0b3add61fbde00e/kugawifiro.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080411831e---jawetopezazugizowepesi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5sspbiebhc2aopl2s58tpi6bpm/xupakoxuminesisu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d686787a9---xixis.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/87651642871.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xudiraxefowovidobaxu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/korozosipug.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/xazomusaxasolaragiteta.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/vuluvaruvitur.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f9ac4aaa---56104638320.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/lasulaxomusit.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/remepunekodufipo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d93c245ed17c72de1528e522b34a6ca0/18455802752.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/17020881255.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/cprgc67ufucm31orcmgqgao6n7/9083257306.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/21604767707.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6a8207c823ce3fb86dbdbbd9db6d8d3c/bujusawolulevawafefibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+cheats+xbox+one+infinite+ammoPDF link annotation
    • 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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 10868 bytes
SHA-256: 21af679cba2ecd75c06bbeaf309199c4b08a64c8cda689395b319bebf6e2867f
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 17104 bytes
SHA-256: b61b992a316cf8dd80e1fe3ead26eabad9203730512ebd5b916750454ffb7a6d
font_02_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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