Malicious PDF — malware analysis report

Static analysis result for SHA-256 d197885cb9c033b1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 18:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47849b7edf7ccb14cbeb850f13ae8eb7 SHA-1: a986cb34b88fa8f61759259be7567b3c05885fcd SHA-256: d197885cb9c033b190e44ec4bd6f7317ccf7ac6f656e99f102120d64da2e4bec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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 https://sandipkumardutta.com/ckfinder/userfiles/files/72602258785.pdf In PDF document text
    • https://a-guskov.ru/uploads/files/40698592078.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/12e62c1fb7a029c4f3d4fe5cd6dd4a9d/31726302485.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/21393698906.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447bf59bed---xegidupaduponiminapomaxux.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/13031735204.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/27224600360.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/114909723.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091907071173499.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/kupojikafo.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/96240308161.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/84898649855.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/refit.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/kozomubujapopo.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/furepafor.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/biwopiramuz.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/minuwipaxipevarola.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/babowida.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/72169470325.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/92342181199.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38528645707.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/80812980216.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kipuloxu.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/5423600348.pdfIn PDF document text
    • http://www.siposferenc.hu/html/69581908238.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/61532449067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apps+to+watch+movies+with+your+friendsPDF 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16872 bytes
SHA-256: 467a9669fd88d122cafdb2e0e8ab2fa040297746bf740871022ade36a23a1e27
font_02_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 11184 bytes
SHA-256: e0455369cb31d587ed52e90df43467310f378433c337676e5832082c6ab4bdd1

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