Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f1b649bed08d80…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 08:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c2092a636713514a7e0225290f75b3a SHA-1: 1f7bcedd1d0188ae989af27494bad5a63782adc0 SHA-256: e4f1b649bed08d8055beeb133af996cae723a6785f0cc8cae5fcfafd98a5fb08
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary attack pattern observed is the use of a link farm to lure users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wasserentkalkung.at/ckfinder/userfiles/files/50383507590.pdf In PDF document text
    • https://maydangson.com/vietkiendo/upload/file/rejiwodufizisufo.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zisorodisaduwuzutu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tikajixukuluwavil.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/xafivot.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurexak.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df6e938b5e---9536062998.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a8099cff19b23296ae70236ffe636b0/pagimosodisuwex.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_69E9EA7D9408DEB5.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/repaxoraxilubunazurisa.pdfIn PDF document text
    • http://imosa.asia/uploads//files/202108080755479413.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ec9d938f7781188e57f3237fa2d3ee11/ruzofuwopewaxevosufofow.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/zoxapusijazisegobajutoxe.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/8073013187.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/fozuzot.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/653aaabab9eaac627f694947109a63bb/fomagikokunoxorosabeg.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609261de9658a---68211755899.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/80871989055.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/34881835236.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/57629733139.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/makudopegalipejilupibixe.pdfIn PDF document text
    • http://liily.jp/upload/file/20210722151231.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91269a3a---62735647905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+does+a+sandwich+weighPDF 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_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10752 bytes
SHA-256: 3f8fb881de4b59a780f1401fd4c265ef322d7486c81c74e3694c85a9c00f7f73
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 16972 bytes
SHA-256: 8730abbc1864e18ad1a348596ced340d9fa7271b7d84060d0619532aaf353efb

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