Malicious PDF — malware analysis report

Static analysis result for SHA-256 3163b66a51b9bbfa…

MALICIOUS

PDF

73.4 KB Created: 2021-08-02 20:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e13d8804e2878049d2edd2bf3f448383 SHA-1: aa872fce9b6b7d5f0a4e68f95293cca8b8ecbce2 SHA-256: 3163b66a51b9bbfa67764c865a5840eb7991462fafa3abb76fb9966e762fe079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=segment+addition+postulate+worksheet+pdf PDF link annotation
    • http://prosquash.by/data/nipije.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/livekadufewafekal.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/filigogo.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9f17fd40315d389bb691d303db11f72e/28334982040.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ak0253tvnp00phsf1l3mhuv1bl/51206347974.pdfIn PDF document text
    • https://curvy.tw/upload/files/vegisudejomomex.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0119fa8d86bee8b2c4ae1860dd5e1903/14451380457.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_9BA3FF23EDC5F53C.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a834f99b98a---61257910996.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998bd805f0---79654423399.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58f486e47e7d1f680946e15a30f61c9/zisemoruvazedobotujutibep.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/72120205860.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/44120040984.pdfIn PDF document text
    • https://latework.cz/soubory/bojujubemurari.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/aaacdf3df6adeb1646b2ac4370eed625/zabiwenomomakikikevi.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/nuxalulideranuxinen.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/82489948665.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27998cbc5---runurazulunuborurebek.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/ratali.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/68089526966.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096f449b9b6a---18097959076.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g5p3c51iktslakpkjspt46ghh9/zabadadunumofekosogajuvu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/wokekidofipegafotuz.pdfIn PDF document text
    • 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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 11296 bytes
SHA-256: 38514cf0082674f783b9159bda507271ba1dde258e9a125a3b2f8dc616ba1fa1
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 15660 bytes
SHA-256: aeff449369b11c8327f98178161b0488e6484f45f1b36d7f20327e1665af0f19

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