Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cc955ea698427a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 07:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5605b73a395ad9caba90ce05d604345 SHA-1: defb8f3fb94ce1bf2e15b6a1d891e7d549f4d176 SHA-256: 76cc955ea698427aabb344c4487ebf9365d04d2f2355bbbea3aa17e5171f8ab3
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 Pdf.Phishing.Trojan. The file contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=kindle+whispersync+not+working
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/57ouapiqsngb7i5o3rn7se1ur2/12510896198.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e1debb40---19534354091.pdf
    • http://paletydozahrady.cz/ckfinder/userfiles/files/6323466507.pdf
    • http://cioccolatogallucci.it/userfiles/file/kukazibomipujoderunidunad.pdf
    • http://lubrifianti-auto.ro/files/file/33674894028.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e5357c4f2b37a61d7dc4942e82ab14ab/bovotapufesijebojudovakeg.pdf
    • http://acecaalcoy.com/userfiles/file/8740528805.pdf
    • http://cncforginghammer.com/d/files/48027408812.pdf
    • http://tryinvest.eu/userfiles/files/rifijufefudalukijunusuka.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c726392913---nawizowitekanuvomasa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1a16a5a7---nowazunerojugokuxidi.pdf
    • http://envisystem.com/upload/userfile/files/14005699112.pdf
    • https://blugarden.eu/file/36357483559.pdf
    • https://advantagelic.com/singhania/downloads/file/sisuselobeze.pdf
    • https://palcev.ru/userfiles/file/mogukatiriwifimogitabepe.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f87934c00---73765424915.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d4ca9dbc93a230c3fd82d57f44395de5/56260247906.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9265721f63---voxogajetolowadusan.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ac36680---28859542779.pdf
    • http://drshapard.com/clients/73598/File/10839480208.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b738b8fc---94087119643.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/dofasefi.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3e1c32de---49605995631.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_off0000e6db.bin
f8a1b187a953b3ad89e4eef8b27655fd90b0a4e70cd2f80ee7fa5c231118d631
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 10912 bytes
font_01_sfnt_off0000ffe1.bin
302e7b690cd585f16f8724da77dca41e97c73ec68a44d0df4f7df541030d8acf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 17356 bytes
font_02_sfnt_off00012d08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 16792 bytes