Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1c4f74f6c3e958…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18af0c4c7f24c29de94c6f63700d1a79 SHA-1: cff506cc5f471280ad971158f4ffb44063a7ea5e SHA-256: 7e1c4f74f6c3e958c259b6966d892afae780b18d25251fe4fc9a11920d482b81
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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.
  • 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://queure.ru/uplcv?utm_term=hp+android+3+jutaan+terbaik PDF link annotation
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/1333353898.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30708b4bc---52672238705.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/78701937664.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/ranigokodijarososaxuro.pdfIn PDF document text
    • http://rvhifi.cz/files/file/sewojajikugetazasemor.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/25517039761.pdfIn PDF document text
    • http://builderall.info/userfiles/file/rofokunomopaku.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0033037f7---52709903080.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3f93073306db314c662bcca4d7b873/35711970594.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_E297AC929CEACC90.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/51244182107.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/jefapi.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/45878142214.pdfIn PDF document text
    • https://kaparatt.com/images/File/dusakubadibivatemibos.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/zupodomirijaliwid.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/zenezemaluronataj.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/92090574120.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613902f6d676a---zegekired.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7b48608f---35478421527.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/34130152721.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/jadefedunajalidid.pdfIn PDF document text
    • http://freetds.net/userfiles/file/nafuvaju.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/80395819111.pdfIn PDF document text
    • http://askaudit.ru/price/xajimuwivirolazupazabidiv.pdfIn PDF document text
    • 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_off0000c1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B0 18852 bytes
SHA-256: 41e7a5f65c0d862b300588b4a43aef4538f17eea2fbc53a964c2673f01457e2b
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 10796 bytes
SHA-256: 13cfe11547a967d9ffe9230a76d4be9e0a163c5f528af408651f270b5a765e3b

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