Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f4d37382ec15ff…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 04:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93da82ba366ba601cea60d55b43a878c SHA-1: 72d472505e49e0a6cf11b13f5c11cfd481cccb5e SHA-256: 35f4d37382ec15ff84711d8c34ef1fc7ce7ca7196278463d2466a2d0eb3e1421
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload. The presence of numerous unknown URLs suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rf8eodnd4sinq44ac9s3r26h0c/riwulideraxixavo.pdf In PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/37143675809.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ninetisosopowesaze.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/18170471496.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/41307086670.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/23176869432.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gidelof.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/warimadovage.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/26668916418.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/tizulawuv.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/zegexepejexitupusipikoz.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/wururotux.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/725004881.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jilivifivoveramezi.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/dizazibeguzojezun.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141dedfa5484---wotew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e905abb3a---1487535897.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/2754177937.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/kowetipojunefinolu.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/muzututugeziwewumojivip.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/19302965021.pdfIn PDF document text
    • https://khanikango.in/file/28109266916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=coc+online+emulatorPDF 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_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 17080 bytes
SHA-256: 45136a3f1a4d162dbb72c0d22cb0a296bb33f9b1501872ad071507ece9f09faa
font_02_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 10356 bytes
SHA-256: 15f18f25bf597103b4ec27106510487359659f1ff6344fd7e5b29da04c14631a