Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caa5bb63c1423c6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 00:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dcfec3ebe7fa8b792217ea4ceae4de5 SHA-1: 2579f28850bdd6c4c29eff5eace5a6a0a9660120 SHA-256: 2caa5bb63c1423c685f86d658bb7c069ec22fd8e928298d5df37371884d77d31
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://satybharat.com/ci/userfiles/files/vuzepajijubisapomutunena.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/gilegajiwifawiveso.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5cadf16d30fb60a7bec8ca108ce366b5/fuxefojovodek.pdfIn PDF document text
    • https://buyafranchise.org/files/files/jatebad.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/tosamasujewika.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29850654170.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/ripatujifaxumalewa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132526e17aa5---pofevuxanodegiwevewut.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c50bf37---pifunimuwimovuwokukexidam.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/99314615806.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45414208271.pdfIn PDF document text
    • https://red-adlay.com/upload/files/35530570915.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jumutemopubozoxurumozepob.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/25630159789.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/97334454079.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/13203972550.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdfIn PDF document text
    • http://art-ball.net/files/file/52627935284.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zizudopijasakaruli.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/48603264531.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/wamusegileso.pdfIn PDF document text
    • http://trevorhannant.com/26547536650.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waziruretumugarifek.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/sigowazopexi.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/57557588885.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52164606411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sign+in+login+livePDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 9896 bytes
SHA-256: 533d8e3cbcecfeee5fb3d3693afd6de85c5f59bf36f91d8a1468376fca508a9b
font_01_sfnt_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 15560 bytes
SHA-256: 48de1cae3fb7381c0da1940a671680ca1eb4fb31b08bf381cd133a896766b0de
font_02_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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