Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16513dbebc728f9…

MALICIOUS

PDF

73.6 KB Created: 2021-08-22 06:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecadd0ce75e6a5b1c9b2e6e4b7f93843 SHA-1: d74ecc394fb67c7611c4ebbd080505699bc35e71 SHA-256: e16513dbebc728f94ae0345d14d051c93288aac5d1613456ff69d97369db2178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external URIs and links to compromised WordPress sites, 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 presence of multiple compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://cructi.ru/uplcv?utm_term=libro+matematicas+cuarto+grado+pdf PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e07af7fd49---vasefukebeduka.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ba13da072d1630eb0d3004d4497acc9c/nekuxodidu.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/80211651260.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s127ljq14elraf2a2ibhf3jg2g/dopowarenoxevev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1orac14lflhhtnr52a4qbhe40p/5814258621.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/lizow.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/71957297161.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/48691271623.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/bisuvu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9799c031144fc21f41afc445abc44eca/28401795813.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c7373cbc8---61600610129.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f95dfcdeaa16eb086fbcc90e179c1bae/saridowusaje.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075957563009---23393654914.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/xexipukilanexusenofubij.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/13774659932.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/nezak.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/remekuxiwenut.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108180246247326.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/runenujasusenuretifamife.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075184ecc68b---25669783214.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/vurafunefuwiweseveromop.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb4155aca---dejorabug.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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 11012 bytes
SHA-256: f1473deaa07247c58ac44d5093642442f4a5902e3e4e9e57f433cd8d29cf89e4
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 15552 bytes
SHA-256: fc2a58865fcbcab36e7485535a4103d83b99916bfca14af9c42e0daa3a243775

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