Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3878e37931cd32…

MALICIOUS

PDF

83.8 KB Created: 2021-07-30 18:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c09b0665b939360b6be15085847becbb SHA-1: a1c9456ab9e4415f34fe0d7f02ec20756b6f409a SHA-256: cd3878e37931cd32bbf04572c15bab5f4f3bb49437754cb2c14d9c2f4d8ef4c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=how+to+insert+a+blank+page+into+a+pdf
    • https://baohohoanglong.com/userfiles/file/26976240563.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/oku22nj90nk9tuaj4d0j1avja9/90858361005.pdf
    • http://beergolfers.com/blog/images/file/83071205707.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d59hq3361aki9qubgfp74svlq3/rosovaror.pdf
    • https://fokusmedia.com/images/uploads/jikofisor.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab06df7c4---75310137818.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ef33f092---vibenapazesi.pdf
    • https://liftsystems.ro/LiftFiles/file/27116808571.pdf
    • http://biotledlight.com/userfiles/file///31270694585.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bbfeae2c---7055086835.pdf
    • http://sunnyten.net/userData/board/file/dobasitotogekudiw.pdf
    • http://oreade-breche.fr/userfiles/file/5859766178.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f54178321d---bowedodefimowedexaxigamo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf03808d80a---nobedenavujetule.pdf
    • https://actorconseil.com/files/file/52066127001.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5779705d142ddc328f86b6bf2aad981d/28173764890.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ce481ed4c66ebb878a22293883352168/91521883408.pdf
    • http://arniestribu.com/campannas/file/xurirovid.pdf
    • https://betenrealestate.com/sites/default/files/file/69003702151.pdf
    • http://beta-rc.com/upload/files/zuged.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/79a452e452f044cb8d4c4b7ab5bbdf39/68973507136.pdf
    • http://karpatskiles.ru/store/files/19002041876.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/13d304b003423d4a941406644706af89/laxamirulujigefufodawol.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_off0000e139.bin
a0bec48dff02d8cd34398d149dba45a08961f74f6d33ae17783d45c618b5f1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17728 bytes
font_01_sfnt_off00010fc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 16792 bytes
font_02_sfnt_off000127dd.bin
fb67a04312a459c133e8dfb089426f25d8408de67e890634f7890e74fd8fe553
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 10980 bytes