Malicious PDF — malware analysis report

Static analysis result for SHA-256 24760ae28d32000b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 06:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfb26fca8b60f98d16848b7b75ffceaa SHA-1: 84a452d5e1ea49f3ee0a095a5c12137dd6607f6a SHA-256: 24760ae28d32000b1092a428777c1309c1b1d5ef572b8e2d3e34645083029baa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous links to potentially compromised websites, likely to deceive users into downloading further malware or divulging sensitive information. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://simonkuehner.de/gfx/userfiles/files/nosirumuwoda.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49575946563.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/66763248883.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/ritisinotazomusawisab.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/1240876307.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/65781996228.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zulomenokaremunexebeka.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12383518878.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/65812493731.pdfIn PDF document text
    • http://zubrcup.by/files/files/20659437098.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/namotaketodarelokizawex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdb5df523---97559091942.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pixibefetazukutole.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/kisadopirexififojo.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/21897841295.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/30b3a8a0613e953ca3248538f3746afe/15960634770.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffaf196a1---kigonozudogoz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93ccb073e---40605476369.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/fofonozemu.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/juleket.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/sududere.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134542bdfa9b---tizewugumir.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b73d2a06deae2faa8e04feda79f07809/21511330989.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/43684716537.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/42226701275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=premium+roblox+apkPDF 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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 17652 bytes
SHA-256: 391c58e049457ed735736afb1b8a87275ac6a6b575759a3a2cbbfbbf3fec1ea2
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10476 bytes
SHA-256: 5cb598b1f05a9ea58b1aece77c25d53105253f9e22c39d25e997cee48a7d60d6

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