Malicious PDF — malware analysis report

Static analysis result for SHA-256 22da3d3532dc34d0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 10:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2dd825058f8bfbe5609d29057177031 SHA-1: f2627d981ea9e1685dba735024c2a2708a93c096 SHA-256: 22da3d3532dc34d00e4c8699d54d7287a559d39d4eed2921180673b608d09a6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=pengertian+natrium+hidroksida+pdf PDF link annotation
    • http://ansonseatery.com/uploads/files/67094804291.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/84941241005.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b2ba8293---98229840076.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e2fe5773cefa6c537a589ae82bd3f72a/gemevoxejiba.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/supojusubiwodurajafoge.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ec1068bce6c95090764d9dc84ad03962/bamomadojane.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21fb631c3---96673386843.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/55804290503.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qqfvre7494o170ehdhnfhraafg/54025082358.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9cc8aa33---79677900450.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2v5632go76pj76muqctm8o6bs0/winonusenugide.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/5822377524.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/jovipiketanirobuvoxe.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vobofipibigewofipipe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/46491167705.pdfIn PDF document text
    • http://byecook.com/ckupload/files/10455375933.pdfIn PDF document text
    • https://fratellifurloni.it/file/jinaselowekabega.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/6549299566.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7420d8d9---gobodexapemipimorixudoz.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9dbdf50bb32fa1fe8715a3324a921f5b/mefufotezed.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1c2a20650594856b155ae9cccedfbba/wulosaxedurejipow.pdfIn PDF document text
    • http://hms31.ru/img/file/durikakuzi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/fusemadazobozifimamimurod.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/805415a9e7a269f3a7d880f4b6efcd6f/55920050718.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/24a8ffa1cf7aa2e5c5514a93c2081a52/20825774582.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/vimerekegomijakaso.pdfIn PDF document text
    • 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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 18300 bytes
SHA-256: c59021f274ae8c3ec86ee71605d55c13d52701e094f88cdcbd1d617e22889c16
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 11092 bytes
SHA-256: b1d6db9a8fb77d4336d6883d57c4a5c4b8ce168269165ba740857be8ac45ac55

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