Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dbaf3cf4cb40e7…

MALICIOUS

PDF

138.6 KB Created: 2021-06-22 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2df3bf5823e6aae4d683ab60e57b67b SHA-1: 4daaa893fcbd37929f20d23de02e0bf5bd812a50 SHA-256: e1dbaf3cf4cb40e778ac7f588ead8442505aadd9c13acf910db518965e27fa0c
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be junk data, not user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74cf8555bc---wukisapojepavafuzet.pdf In PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42974823234.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3500293891---lorepuz.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/62575907179.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/16549530990.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/zafadologikibuwupimen.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/17016572147.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/wovadina.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbae97649943bfcb3ad3266b0289355f/24951057292.pdfIn PDF document text
    • https://magerp.org/upload/files/69995389536.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f65fd1e7a6899408e679911b7a732393/56215047369.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e31d6427c---kifagetepexosolok.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16086145d6a1f7---92914930649.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b46fa7b1fdc---18458631666.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/74580264215.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/niferetujaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=final+fantasy+7+walkthrough+androidPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0F4 3904 bytes
SHA-256: 8430493711053f90aec99d36c4e20cd2e4f8eb3bf6cd751b64522ef0587daa09
font_01_sfnt_off0001aeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEEA 5464 bytes
SHA-256: de363e4384c5a400a3e8d0b073aa7de9cf72d699dda17554914c3a5c4855067a
font_02_sfnt_off0001c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C19A 6264 bytes
SHA-256: dde114c05c168069d57fb771c0d68ef2f10db21995a5e7e4095125df2b2c8abb
font_03_sfnt_off0001d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6E0 15296 bytes
SHA-256: 8c0602ad01de7fe12a6c1f2b5e74c6337e748279c4da21944092a4e5463f1cbe
font_04_sfnt_off0002065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2065E 16232 bytes
SHA-256: 0b4f0929fd87ab9a0aeeeb9215df101e242f4725806bcc0bc4e777280dd6ae7e

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