Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d87a4ac8acd1509…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 16:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 327350e71eaf96ce410f0ec41a95144b SHA-1: 599980aaa79dd77aa58cfb0936e84dc7eda82382 SHA-256: 3d87a4ac8acd150970f5bcd128dfed2ec0769c3647cb5b98dd28957ff616c2ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites and a link farm heuristic, indicating an attempt to redirect users to malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seattledesis.com/fckeditor/file/xosuxokonezatitunometu.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164b13b210---kakagokarimemolirubemere.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/50865692263.pdfIn PDF document text
    • http://ijfbn.com/editor_up/rigezu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591dbb8ecd---kinedimunozowedu.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/nirivokeruvuluxu.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/61300058072.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/84544156604.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/riwuwevodubusobi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/50802952002.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d30b3a6d6---tatepuketetevimubini.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sesorib.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d75723a3---giduripogiruwedofevax.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/wamasogitorira.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/midikejexenategudirezovot.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tebero.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pevenodusefakidoti.pdfIn PDF document text
    • http://cecev.com/stockages/files/rurabudupisopakix.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070428017775.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/togexixiniwava.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/rerig.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/aokra43eo9obmgnraqljbmiio5/88104669662.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tamoresolanekawo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613692c37b5bd---tomusutu.pdfIn PDF document text
    • https://empresa-venta.hr/files/32736611196.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57409845790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arabic+alphabet+practice+worksheetsPDF 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_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 10664 bytes
SHA-256: 54a6ea06fd6e6981434846337ee9e047fb0bb7a8d3b2dbd647680371d371bfa3
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 20432 bytes
SHA-256: c3983aa79f8e41801dc1aef41e43fad7bd7562bdec71733e2c0c666f1ad207cc