Malicious PDF — malware analysis report

Static analysis result for SHA-256 834dfa54da85ba5d…

MALICIOUS

PDF

95.3 KB Created: 2021-07-27 03:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 256bd3c1d69b7fefe3322179f73b00e2 SHA-1: db46955533b52c8ee919b3e7e46d6464e81f552b SHA-256: 834dfa54da85ba5da439741f9a9d0d85eb39b2dd2c94b9b2d3b12a03c4b61921
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view its content. This is a common method for delivering malware or stealing credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs suggest a link farm hosted on compromised or disposable domains, likely serving as a distribution point for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://topupdana.com/contents//files/venutifidipuzabudepumok.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pu3vm169qhmpb366p7i092spv1/lemiwakufowolekonotune.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c6b66334bdb4b51f629a927d0c97d840/5634187737.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/dobuba.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/122e43becf5f1da651e70d421ae43188/laxosunaniwekewarux.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/705564d3f74274ffdee784c923643bb4/nekasowifepimedi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7d775d3c---nonebipovafi.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/50537782856.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zivagixivimosiz.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/82029967463.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/44ade2cb8a5b3fadd4e383766ec6b108/92844620087.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/sedadenugebep.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/78577916143.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5cac634393b723b442216d85018cd861/jivizawarero.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/42218096816.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nuvuvav.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/riromexi.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jejitirawa.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/3249614256.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9a242b66---damewirisusoroguwo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/72824986519.pdfIn PDF document text
    • https://aashianarealty.com/file/36846506051.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/77f4c1ea18ceca28a51c87a2297b707e/rapilakeguzixaz.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vebugutobopamatudobiwusu.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/zugewolepupezato.pdfIn PDF document text
    • http://ledson.ru/upload_picture/66538584185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whatsapp+plus+anti+blokir+terbaruPDF 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_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 10672 bytes
SHA-256: b99f718f62543a0fef57f5d2cda1ab648bdf5fcd966f3ff8bbee68ba04913d7a
font_02_sfnt_off00014236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14236 17092 bytes
SHA-256: f2c2e6ce82217ba5df3eaee508b58b6342ff7368512baf6b1d880bd51fde881e

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