Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde41df463d6d443…

MALICIOUS

PDF

112.7 KB Created: 2021-06-30 17:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dcf07e9aa6d021e699e033a1fd68f8a SHA-1: 83fcdbf2ff61a09848b2c178bd2171df88a4c613 SHA-256: bde41df463d6d4431ce3efa73218569e9bc0d53bc89b71e9c5f223ffd1c1279b
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. The PDF's structure and the nature of the embedded links suggest a tactic to leverage compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962924eae0f---5764867081.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0435e75c---kobibon.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/wafodelufividoritedidaf.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7373aacce0c102119ff3418ba42bd34/dobitumifulusiputu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/95938870927.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/gasijudujejaxepuvufal.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a356d00205c---boxonomozojobinanetarutub.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/tepefukorajekegapubuxenej.pdfIn PDF document text
    • http://minipit.com/data/files/83163360154.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4plnbsupjva0b2rtofotom496k/38541066762.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501165604104197.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/af2d84618a75fc6474cbc685e5838c2c/9576001400.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a7da7c546ab21af04a5560b7a3ab9a34/82465506824.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gvamm5gbqcrn8pt5c9584h93oa/74838550254.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/juzudapalezixap.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb572ca76---ginoron.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a404571ce---jidajuruketilapodelovila.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c070a127fbb---tasotibalilonaripesogurob.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/45872699433.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/n596dhc22kkuqt7c7ahlbenvo3/92540858619.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/cup2rvlh8hp5a5aa9iqq8li9sf/kiborugog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0c0c4a0e---98731196095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+for+all+it%27s+worthPDF 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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10484 bytes
SHA-256: beb92e62f8e1d90a078e4095bdc3e6c0e373c78408519b413e0fef9e4af58277
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 17052 bytes
SHA-256: be53e087517d75f39089b16c3410e759d098725975739b456de27f43c0e5724a
font_02_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 47252 bytes
SHA-256: a3afd9c7cc7f7b9f0f1491c45f705c12f8948303ace0347d2e52475ed020c240
font_03_sfnt_off00019b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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