Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c56519e60af364…

MALICIOUS

PDF

84.8 KB Created: 2021-07-19 04:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cc1780fcfd10460db6a895624609251 SHA-1: 26009ca63078ae7d63026be5abb4ab610ffe2356 SHA-256: 90c56519e60af364ab9700b3e0744087483630e538fe64a98bc612ce5a284a8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://khanaphatgroup.com/UserFiles/file/67570552.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b6e11921423a435dd89c17be72733528/16864947473.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/sabanokonarezalazi.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/vajinulumegebuwewozazadex.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/006f88e4aa4fed967a8df77cac73e4c5/rufudug.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://unosms.us/userfiles/file/wubetutu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160943e0961145---72910428553.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/76301101384.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/94554988057.pdfIn PDF document text
    • https://sbufficio.it/file/bezesesazuroxi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb11b8cd1a---budebezuzemo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca9ad884c---35039754205.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/merisowoleligudeveza.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/r8cnkn9dv9nuccmiueriojqkmn/mopurodimedozi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc80a67c0---78400175718.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/72050726843.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fvk8b7fbiaqtsbiul1lsdd1irf/danetadalizumoxin.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/49725744636.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fadd9a050---pogifu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/59852990784.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/92057913154.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xamog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96fa8c9cc---98698136072.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e9b7a1a89fd4bb834cc8351a336a61d6/26496884459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hopalong+cassidy+pride+of+the+westPDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 17168 bytes
SHA-256: ea5ce00a3107392c3523a38b652588d363b7605a6f1c89cefa06d624bf75967a
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 11092 bytes
SHA-256: bd7dcfd2a832b13de199b61820760054db8643d632aa3129f3cf55ee9aff1e60
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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