Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09144caf4ff9f69…

MALICIOUS

PDF

104.3 KB Created: 2021-10-12 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37c0966ba37d45ada9eea7bcefeb66e5 SHA-1: 7ea814d3525c2200b5452f7168ece4a7fc5dd670 SHA-256: e09144caf4ff9f696abce85042a78ee2ed3b134177beefa082d0ffb623a4a765
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting and compromised sites suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://cofetariafraguta.ro/UserFiles/file/2715458361.pdf In PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/99264734536.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/80045724027.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/55389066872.pdfIn PDF document text
    • http://djapm.com/userfiles/file/54583672160.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/48445982902.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595f462c1de---rotolajefedape.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/52565884410.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/kadazoxubezuzovat.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zevegijezanudesu.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/ruzawejanekalet.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/88311921193.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/79995861339.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161575a49a2b76---37213844085.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/2018016128.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/gizarakiwuwero.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92860037026.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/zabafuzatobokutar.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/velixumumetakamabogaxa.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lasarekowofazemenujijinuj.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/koripezawevu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/39422010632.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/babikenerabisewa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161564f2e9d101---2112613728.pdfIn PDF document text
    • http://veitali.com/upload/files/1533059756.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=in+which+movie+thanos+first+appearedPDF 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_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 19884 bytes
SHA-256: 4e49b4c387b07655fe480f405ab9ae18dc670b2a8cd9eea0ad0371038554f2db
font_01_sfnt_off000161b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C7 10940 bytes
SHA-256: 5c7f3da379c406f5874516ef8e8ac5ccbae3d0dbff1875d786ac05cbd0582050