Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c459c4d3da2952…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 19:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7476f01da8783846ed655349039afe3e SHA-1: b3be25523cfd66c364e0cd6a3eb594950a52be11 SHA-256: 57c459c4d3da295238e604e14784adc7c8e06625daa14820fd0e8d992819d39a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://ketchas.ru/uplcv?utm_term=mod+bangbang+rabbit PDF link annotation
    • http://neza.cz/UserFiles/File/temokukuginidefixegiwisew.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/96179923189.pdfIn PDF document text
    • http://raczcsalad.hu/files/gudagevedud.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/sapopawopanisowidezomakut.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/zofezebagomodozunaraduz.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/mitiperuxanevanupi.pdfIn PDF document text
    • https://kawanmto.info/contents/files/31483025465.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vagudabofikewugonewaluniw.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/rasewaxozelixorepabopik.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/96633575931.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/dituwigejamipi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/741f0004fed161cb84d14d57b1b57175/457803488.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/49164215552.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/totud.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/34524439986.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/mezoxobirajafevavivita.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210917_130034.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/53237031510.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910175000.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fodosalegijoxogevoxurug.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/sizuxa.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/tatinijoxalekav.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/69714855072.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c723557b7---36107620072.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/bedoxevejun.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/lojasumufonagadisakunan.pdfIn PDF document text
    • 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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 10212 bytes
SHA-256: 38326e77d026321be405070260bd77d2181487a0d327cf7a523aa4ca67186ab3
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 17580 bytes
SHA-256: 8bf5f50957c53c9b64596aadcdd01d1205a25bbfab799da935a692116d449b4c