Malicious PDF — malware analysis report

Static analysis result for SHA-256 232aba3141f6b458…

MALICIOUS

PDF

81.4 KB Created: 2021-08-16 01:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f5508acb869a45505486d26956abc91 SHA-1: 8d6e18ba27539c9dabd5b34a554100a1791ede05 SHA-256: 232aba3141f6b458c930d1b05a3bb8751e657c989d6f63c84e5574a2d55e729c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, which is then intended to be opened with a password provided by the document itself, a common tactic in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kovosluzba-praha.cz/res/file/ligisanogalodexi.pdf In PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/3t198pbaklhrr3l8p80uu2pjjm/31231595667.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2696405f7961e5bf8d3fdfbed4e256d0/gofenefo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087691634a23---kefekilegetetazuzako.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7kh5b8s55f31c498j888mrhsb1/pasisalafarubiwaz.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/21601594828.pdfIn PDF document text
    • https://pmms-online.com/assets/file/vigisonifeguzonov.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/58503715065.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fb97139709ccd9cbe0a06468633be661/15339622496.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r1lu42v90um17vnra92nu5eis4/zagikogugexivifovato.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/42c331a4a3e58ba6b8285c818ee3e2a5/nosov.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf34f0f60---wepudajudodudufikeliwom.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2tni0u1sdacmjle9nmkrgtheci/majuzenedovalelokudenipi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kogesinokemosefadud.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/37172096386.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/lopofunasisukijidumobinon.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ob98vj88hp111r3k8fo4b8eb36/xejowemu.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/samamoki.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zalafisamoselafugorisi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0d4527e0b681957d92426270bececcbf/12397938980.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/69499288052.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tekezadaxanusugaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=snes+emulador+para+ps2PDF link annotation
    • 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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10656 bytes
SHA-256: ca7e4c8a90bee6e74be9ea92cdd2951a286ca381cbf2510894e7676e1fe2108b
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 19156 bytes
SHA-256: 5ec6cb0cb32f77d970fc3bae4ee0dde4731f96b6f293a6f234deb0914b0433c6

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