Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8170c562063395…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 00:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88b04fb14577e2fbc91febd5e56b02d1 SHA-1: da4e1b9fb15b0145a1fd978f36193815b2834f48 SHA-256: 6e8170c56206339542f0bf30b54f48054f0e59f5bd6294a45e806378a5e494e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_JS: Embedded JS stream' and the ML classifier output strongly indicate malicious intent. The numerous external URIs, including those hosted on compromised CMS platforms, suggest the PDF is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=games+using+phone+as+controller
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92418270135.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16130052079b83---32217223780.pdf
    • http://hrdiborice.cz/erucom1/files/files/67149624408.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/56600878305.pdf
    • https://sagarexpress.com/userfiles/file/13304344621.pdf
    • http://portaldo.eu/contenuti/upload/file/lupuribanidirawosadorano.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/20437938686.pdf
    • http://sungwoo-n.com/userfiles/file/25805648399.pdf
    • https://gangnampools.com/contents/files/54879131150.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf57b9876dc5c903049912d86af206ad/70304368576.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/jonokefabakezoru.pdf
    • https://olterus.net/contents/files/ramujitisut.pdf
    • https://distriparkbotlek.nl/userfiles/files/pavenogesuropesolifekol.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5df96521b8eae833f1dc85cfeaf03c52/jevadokapexudaxesevinamim.pdf
    • http://musikpark-live.de/userfiles/file/jorewiputuwosafox.pdf
    • http://ajtoablakcentrum.com/_user/file/16480721066.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/36809562023.pdf
    • http://konakelektrik.com/userfiles/file/24960327634.pdf
    • https://meganimal.pt/site/upload/file/vukexijuvoxewez.pdf
    • https://gres-k.cat/userfiles/file/42911528890.pdf
    • http://mnwebdesign.dk/userfiles/file/66263484506.pdf
    • http://grandrosso.com/js/upload/files/gikilovup.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b8a78052---41996563574.pdf
    • http://blueleaves.ru/userfiles/file/81575713957.pdf
    • http://bbmeti.it/userfiles/files/nibupe.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/kutinimesuzogiditijubem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c336.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 16792 bytes
font_01_sfnt_off0000db48.bin
fa66ad4537261332ee076427d66d4ab55cbc6f559c270b11bfe7b80006efec43
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 15648 bytes
font_02_sfnt_off00010354.bin
abdbcaac561f14867a72195464298232dea0350f9496094eaed80247e13369fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10960 bytes