Malicious PDF — malware analysis report

Static analysis result for SHA-256 934ddc45da8281f2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 04:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 684d01ed6d841ec8a8743ceb183c7faf SHA-1: 205bf6a69c606ed96a1642ce0ac61f63b71921f1 SHA-256: 934ddc45da8281f250a0878f0e69d99fe9737e18c90e16d79cd01f545bfe4168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=poemas+fernando+pessoa+pdf PDF link annotation
    • http://bijverhoeven.nl/uploads/files/95532350653.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/pukumaduganupifebuzuwin.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/35226839334.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee483e2317b---34528454570.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54467273b8---164712155.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8014d00f.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/velezunevakuzagotololi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21147199190.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add212df16a---tixolewoxevenudikereruwo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9622d3d731d21148e4eb11bb2f1db591/fidesibenuguwok.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/jomapixagozixajilom.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b60bdffec354d29a00be0cd4e467738a/68446402963.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/93207240386.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/kutifedifija.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/83157ff3e0f22534d42240ba7e6244a6/95056217499.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/261g57fap8l7pl9up78g0cm9ev/62550961710.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d07ecf58197a851949aacb869ee2675f/60935344245.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cb7c0ea06---72130091707.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/27a61196cdc8427ab44b96e0e2e6f80b/12513299061.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/2333352864.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d009a9d144---gevowufinofodavabe.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/zapajekerud.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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 20852 bytes
SHA-256: 0077a9b29475dab313180133e8008dc9fa38a258c7dbab07ab8650c4f0b4c1c6
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10424 bytes
SHA-256: 9cb01e484d709f5a68bb91d1b4df10a621399cd06cc264f28d0c3f789d6c278c

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