Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e923b04b505f00…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 856944ce4cb9ce9bad76799938a87d73 SHA-1: fbbb35440bbf154b185415f5a499d077b39c9fb9 SHA-256: a5e923b04b505f008c7b9c6a1815ce0123a6d7dd98f146d49f0114d3474fbfa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or 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://krisoc.ru/uplcv?utm_term=convert+the+following+binary+number+to+octal PDF link annotation
    • http://www.heksan.com.pl/file/naxogosibasenosevimagazu.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/mazupivore.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tenamilededuva.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/91037409335.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081114563698.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dusonisipazijap.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/og98iue1a3q9bikrhipe93fq66/vekovetinepifofefesusipuw.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c1161464---71299320876.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/835183d4193adc8e705b13e4230675d1/47621857499.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/79614447116.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4fea57f0e56c2bfa4d129e73759a3411/bapigaguwebisuleko.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ct3t9pfv00ul82mkeu0ollla3p/jikajipukil.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896b42ca4b7---bunudurisigatovivisekoje.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/46473398566.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/68398438955.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db557c7941---96443031661.pdfIn PDF document text
    • http://msiutilities.biz/documents/49653127029.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30b567fe---21778704782.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/85236673320.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb26824207---girivodalo.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/vokew.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608768106d432---sidipidufurozakoludesib.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 11152 bytes
SHA-256: 2568ef4a53929dd2ed10531b8765a4c60a7d58d0ab4c6a8a00deda70c132fc72
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 18512 bytes
SHA-256: 87bb4e82c2b09c20f84169cdf7743fba1951f99fb9c07284abe26cceacdf0e95
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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