Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d021d5e95c5b760…

MALICIOUS

PDF

88.9 KB Created: 2021-08-04 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d67723cdf7a2d87a06cbe598f05f31c SHA-1: c5afe49595ca06137e2be2d9f67088c3eb61a73f SHA-256: 3d021d5e95c5b7607a09d2563a8aab157c8fa8ee9f16910105fe568dbb8cfe65
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The primary attack pattern involves redirecting users through these links, likely to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://deniz-sogutma.org/img/userfiles/file/divijafitozobi.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/kaludebuwikesexipuzadudub.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nogikisiligibibupobeno.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/36460615767.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/97960348946.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210716214613_NTY3NzE5NDg1NjI=.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/nuxomebabawulozuzepi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9bdbhrce1id38sebshk9gnu4c2/58869529506.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c3c41e55805824a76342b7583f07fd54/51061714395.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/18393195153.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/xivimiwokibamovogobeka.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/57879173008.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wivopejovuwite.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/rotopimijoforoja.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/zavulemi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0692871531---99943512097.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/roserur.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zenope.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/55552851594.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/murejakinaranoda.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81e2e419d---jogukipimokew.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/batege.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/93381386559.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105bc532574e---69430336790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cual+es+la+variable+dependiente+e+independiente+en+una+graficaPDF 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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 11012 bytes
SHA-256: bf6f66ec7bccd022212e5c03de662342015fead27b44e5ea8b9330d0c0fbd179
font_01_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 19140 bytes
SHA-256: 1082980013b7a785df02a8d6db43c2d72a9edc3416d8f10e0e385b63a47e6b2a

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