Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d0c6c8ca80a3c8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 22:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1035c3dc32cd5cd15b359a4016e8bcdf SHA-1: f9a62d4dee91ee3706848fbc4a593bed62856bc1 SHA-256: 18d0c6c8ca80a3c85d64c9906b8dec99b1bb7f41aa9dea80c9264622e5fe8488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ghnservizi.com/file/41104848525.pdf In PDF document text
    • https://31app.com/userfiles/file/77552852807.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6dd2cdc6---95166560456.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gjh9i5qbefs3mv42icdmsfq64f/46477848491.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138cb737e2---retetogibegusozadabotinax.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/13461370571.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/11478824399.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/zoxebotavarojerepifaxezul.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/43195672184.pdfIn PDF document text
    • http://novafish.it/userfiles/files/duvukuzuramopulaxoji.pdfIn PDF document text
    • http://punaide.com/userfiles/files/viwebatuxinexewimasixip.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/85781629798.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-16/20210916012444588542.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/17583008619.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/jimazawefo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xusufidapuxelox.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901170131.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/tulozukelolojuwotopawosi.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/21308483342.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9gjpr488q47seog7u8j9kcr462/11805454487.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tofadi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/luloxalujo.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/16716957820.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/40161870130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=measure+of+angle+in+radiansPDF 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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 16260 bytes
SHA-256: 3773e9028fa111bc0fa6fb6764f610769a36448425e363d7d3d49b799f86e6be
font_01_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 10524 bytes
SHA-256: 97ec0d4acf1643ae89acdb831a33d6a9aaa4e304e1c9223b346c7add44ed4d0b
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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