Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f147dc1171d8c7…

MALICIOUS

PDF

86.9 KB Created: 2021-07-22 10:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2badd79f3ce3759a0e8cf36a5a6ae2 SHA-1: 39ad671761c8d1130fa9d8624acf3f201e5947d7 SHA-256: f0f147dc1171d8c7f48d01ba61efe48b074280ba733c3968946b4451f4a1074b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sap1mo3hl9l7aptcvkair98432/rogukujuputajebe.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdf
    • https://abugfreemind.com/userfiles/file/40800375232.pdf
    • https://digireg.org/upload/47548335173.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df66fd65---livanegafizodibevebe.pdf
    • http://ltptech.vn/uploads/userfiles/file/68390220404.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bc9fc11c82fc3107843057ef15f02e4/jabejexekog.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/82763361258.pdf
    • http://iglozawiercie.pl/zdjecia/file/wujuwatujuxutu.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5d53b1ed19135eb6f03d85eea2c7c0c0/32647818884.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a6ba645c1---xebigerinidenewalasel.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16243642656674.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160728de57ec3e---wenikesafigukujosikinileg.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fqbg2mmvkm62a6v55cerv873j6/46694925506.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb7b5e---zukukumewetukosewedasi.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2a09fc2e84137cf99c90735822751c74/39164362959.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/2d3a78629f23af5d3800679f80d72f1d/96457817165.pdf
    • http://everbeenmagnet.com/js/upfiles/files/53567696904.pdf
    • https://machnhaduong.com/images/uploads/files/rujopomugad.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3078c3e---nidizikoneputebasure.pdf
    • https://angkagenap.com/contents//files/2069677531.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ts+eamcet+previous+question+papers
    • 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_off0000ee26.bin
fadd3e82039c2050700d6e013fc5b9a66993bb6909e2e31b7ff6296935f2c187
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 17116 bytes
font_01_sfnt_off00011b21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
font_02_sfnt_off00013338.bin
1dd32946fc89353358f5857cdcbe74b7701c2f855e1336f3b31d1f5de6a7a0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 10764 bytes