Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d1e08fa0ca7ef…

MALICIOUS

PDF

91.9 KB Created: 2021-08-13 12:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 136b553f70194e446a00d65af1f13d61 SHA-1: d7a7838e7f073aa29d99ff2a03ad2ebd4eea0a28 SHA-256: 923d1e08fa0ca7ef9f3c0ba3be01553b7944fc4128e20f46cba321a573c1fe74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://france-ex.com/images/blog//file/reruwadol.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c506e4131f4---83578502438.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nenikijolata.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a486588d72e2b2d9722888a36b4b27bb/5432749868.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539d5a7ca---bugomatesuzasativo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8857da63801c3b9590ea37f3df260193/33678989421.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/venopujafuginizezexaxisug.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/mdf4c00k98u4rungt0br9ko3nk/sulakakegunu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1745251348.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/9030125376.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f922ed3ba87e4efe7cb08d5e5ddca52d/niwifodafanotufiwoxi.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/16382743705.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/76653f59fdabd44386b1dd3fbe1a7ccd/sibivusi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/bd1c6bb44fb249390faf6cd818678539/jetala.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/5062712316.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7f0927e538aeda872ab6d01c1cbdb2aa/vakinidobukavetonefew.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b5d7e9bcab7e3aac075114222be6af3/6408375904.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/21547049347.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45711016937.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/pifurumozakeximiribuf.pdfIn PDF document text
    • http://dejede.com/userfiles/file/17319339496.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nikigibo.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/69990014550.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf7a10c1f---63599719316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+death+note+on+netflix+censoredPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10624 bytes
SHA-256: bf58fb968b9aeafd920a213ba3c2ba0c1ca6336eb798ed30def61349b1089f51
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 2124 bytes
SHA-256: 1b7010bc5e81b08c8c87c5780b3d1ad1a8484abb65962c62f9820eee2e751d75
font_03_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 17336 bytes
SHA-256: 2c098d5d5fe4e92a953ad7d217e349e27ae176362d6bb89cbf244b7149f25732