Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae68b76dfa5749e0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 05:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 692757de03d5f0ecf1c3703ad8027a82 SHA-1: 8b4b09ad557e0d955508cb4415ff733e811fbcf0 SHA-256: ae68b76dfa5749e04446251040a610cf41a1cb6fcda1306689b63780213c0c97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/aba7vo92j2ksj98522sa1s9v3p/78619093882.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1f6aa989---51858774231.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/85508331621.pdfIn PDF document text
    • http://195exim.com/datas/files/54863416724.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/gebukuto.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/05e737e269e9a557bf9fbf1acf4e1f61/65194167469.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3deeeb1a0---8808231129.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b111192dfa---norijukureve.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6ae32cea8969e490bdcd22f9038f6485/93894814044.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/sedobugukon.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/wupebifojajexomikepuwop.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/53175321442.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tixeparox.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/19347850288.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/galemovefotizopi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/gatalugaxujopameletu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/aa6ccef9d83dc8e3671561d02bcaa641/rewapetokodobawiwoje.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/4168527209.pdfIn PDF document text
    • http://usagimatur.com/files/others/sulorofapilokimor.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210826162346.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c45a2dc11b---34461086429.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/39476171895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+rice+good+for+ketoPDF 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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 18112 bytes
SHA-256: a76ee9e24d92a006c82698fb1ac3ac1781c13dd0f461438931a0e6e8d54d7601
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10384 bytes
SHA-256: 87798274e4ee1a9980b39614410e372e643b1bf910011d7ce8c91d92e537720e
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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