Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18ac3272f8c9b7b…

MALICIOUS

PDF

84.7 KB Created: 2021-08-12 16:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5bd96387f8ac0c0f16629c1f17c1c21a SHA-1: 92e1a7f18487fa7c5ed2643d69ddd97512e435bd SHA-256: e18ac3272f8c9b7b2b5f8f54076c4cc0e9371a4e168629ed4b620e51b3b09f2c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=shadow+fight+2+special+edition+hacked+apk+android+1 PDF link annotation
    • http://a-aqua.fr/ressource/site-image/files/18433228514.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/797e7e6749c2881ecac36183f2db5b17.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/witawobenesoburujefasa.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/99171462666.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a5f5febb---wabazuzupebekefilaji.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/41670826402.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4ca50fd8---tasedik.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81764978920.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sijurer.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/61305146176.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/21117205714.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161118c72ae2bb---60631992756.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090593d2d5fc---begulodewevurexi.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejufereleramexezopa.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bunawurajebudu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/foxamasogugis.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/72efaf3961f11bbbddf3f2d1f3b90659/60466000329.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d17a6bda9b5590d97f434b5f215e8211/2393002640.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/komilinosorelas.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilulutubidadejavutas.pdfIn PDF document text
    • http://benrassam.com/uploads/files/tazezij.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/64af564617d2cb721fd20ed0a125a968/joxubozedidekono.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a2a88ea4---80487054138.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/18470556125.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 11324 bytes
SHA-256: 1f0ea6da645287b7b083cd9304f94260e7cd0da302a3e66082f2f4070ae16a6d
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16364 bytes
SHA-256: f6f5cdc391c9df63dddcbfda063af94930d3c35d25d4dad50b5d24a3ba61855d
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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