Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1abee08a526e2e…

MALICIOUS

PDF

81.1 KB Created: 2021-10-06 20:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1c2ae506d8592849d372d2d35b2e58ca SHA-1: 403a3c3efb0b4f775c8c71b6a98211311f7436af SHA-256: 6e1abee08a526e2ee8567bef2ae2923a6408deeba6049d979c790f6a9e1c6306
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristics indicate a link farm designed to trick users into downloading further malicious content, likely a phishing or malware delivery scheme. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vignolaweb.it/ckfinder/userfiles/files/34018269206.pdf In PDF document text
    • http://megatex-plast.ru/pub/file/lujalaleriledesopi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109221958319846891lwesgje7rz4.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/93555772248.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/12678342058.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a10006aca---60992995378.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7d79a7b053a1ddabcdc1b46f9c7dd5e2/50076673035.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/96479196996.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/xovavedepomisibodizerape.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/58717326487.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/82951000066.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/84727192815.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/45704047566.pdfIn PDF document text
    • https://rjpexport.com/files/pofamuzolapasebimoji.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/34357959665.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/nidekejaxikasusonujuke.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/xugarovekulerobilijesosu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20211006010050_159629648.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/rukix.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398fe2834f9---57891924619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stoecker+design+of+thermal+systems+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_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 11348 bytes
SHA-256: 6d70cd17a535399d7fe64a09e050737e81a8f09fd5cb222b437248f1bb659718
font_02_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 19180 bytes
SHA-256: 9cc150d74c407e0d3df16b9b328011a92da5ceb1f3671027e6dca24e6f51a133

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