Malicious PDF — malware analysis report

Static analysis result for SHA-256 8762163ff4e5107b…

MALICIOUS

PDF

127.1 KB Created: 2021-08-23 11:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2202053553645c2914f31dc7e3781a7 SHA-1: 53fdd1ae6820d947b5d6148859845383afae88e6 SHA-256: 8762163ff4e5107b345d7f63018e5a7a23a1dfad0ff65ff19764722abd1a1278
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. The primary goal appears to be directing users to malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://advance-pack.com/editor_upload/file/82608444551.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/7071144697.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cc720048f---mubojosuloxoritor.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39161630211.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/10065869628.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/92964625501.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/41949854822.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce70446fa45---temolusedugur.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f115746d5---43861770794.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b735357e3ff---34779099665.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/salunisosulimaruzazegolad.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc916f2489c04e3f28fb07870f3397a9/43765546311.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/78sa5g2qb0dr5vglqvouht87v7/27596952350.pdfIn PDF document text
    • http://championsview.net/userimages/74972446683.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/fuvaraxa.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/bafot.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ccc21662---86418244869.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611e21da00462---wularakojemu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/58956f4790edeaba6c87e0bdeeda4974/kerolorelavipa.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/retipobowutawojepamopopug.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082048e23613---zumikikabamuwilupikar.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/58315232317.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/sojaworolazetajokujav.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/70487162226.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/mogivawijaluwekut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+many+shots+of+jagermeister+to+get+drunkPDF 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_off00018a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A260 18312 bytes
SHA-256: 0314505cfda98538e4cadbee18786af780551a7133308d1b4c2ae0e026aef1ee
font_02_sfnt_off0001d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D30D 11268 bytes
SHA-256: 35a0c9f021bc64ad47b0b990c61b36616fb0252e8e57cff0a1751eed8dfda39b

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