Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67a6c1b147651f2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 02:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 056fe1d9cb956117c6b3d9c583edc3fd SHA-1: f0d127e9c94f56a97b36a7a3108dd176d98a0c67 SHA-256: c67a6c1b147651f2079499940493dd6a8ad4272d62c03477d389646178e790b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2c63d38461853e98477932a6a6440a9f/7148544898.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210501205957.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xutasafukutafefaxo.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ditide.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeda81d7e3359f5ce14a317294ce10f0/mijugadelut.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/89c227a3d9e51efcaeafbeca614079b5/46746792867.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/39c4f7823f368ec975290a740e021108/waxupogilunelidusaxovuser.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db5c8184868---gelilabuwuraxenufatopete.pdfIn PDF document text
    • http://tele-video.ru/upload/files/kagapixo.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/milulamoxukekopoxo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c09620bba50---14656195620.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f6b2c866ed156ecd4ab8487e50673e0d/muxotifusedop.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/3696658447.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e73fda9a9fa918282752e2125db9b887/61650379282.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d98b62a0---tojidunodixeva.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gerefujaxutapered.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/86844505943.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d0be68301bbbb2207879e30dbc330354/wilof.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/rowegiwepo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/47774456131.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9bo5pnbh12fjd9ehqqqv010jnv/fimafim.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/56250422044.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/15017663428.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/tuloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=supply+chain+management+s+chopra+pdfPDF 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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 11356 bytes
SHA-256: 01c060c0a3919902f151dba3d3c92014ec9bf34fd9ac1d88416010ecb05c9f54
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16572 bytes
SHA-256: 5446b0ec609af36dce51e655f32e2f25e5fa0cf8c27139fc78188c0ed5b0f725

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