Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc1e9b703750414…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 13:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f39537b4f8bc30065b565446fee7a1c0 SHA-1: 500da3cc7a7287defe8e56d2d6008c91640d1e60 SHA-256: fdc1e9b70375041453a0313c39aab2994ad59c8ddf05e5a511c79f7c5b71e1a7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or exploit. The embedded JavaScript is likely responsible for initiating the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/59868648756.pdf In PDF document text
    • http://recviem.ru/img/upload/47542760335.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/fakiginiguvijigoguga.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530f7631bd---67267051638.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kadanovobuvibuv.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/34997220439.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/guxelimimadurevawixipa.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/sasolovanegeba.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef91c872---gidanuvogitubudeb.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96838457452.pdfIn PDF document text
    • http://julianina.dk/upload/file/84590609196.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xibowaganeketoximiwef.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/33761524095.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132aad340d55---81485487876.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mofutomopodudosisuvo.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wolakibiz.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/45808941476.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/14048417387.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dazunewuterenemimokobijiv.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/gozadaxuziboviwuvidex.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vurodokojowasexefulasop.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/54069600708.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/samifovosizadi.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/38051454105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=global+business+today+11th+edition+pdf+free+downloadPDF 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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 11124 bytes
SHA-256: 82614ed386f0341af95147df45c4b9ef2f55fb8015f7ae3e7eb44abb412b0cdd
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 17256 bytes
SHA-256: 8ce7647c5223725b4e8fe28d0ba08f42672ddd6528799d5e82f04c7aa12161c8