Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec3e6129ffcc488…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 23:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4c6593a184fc87f9899d85b0e600ef40 SHA-1: 6eaffbff47c878dd4c6441f6b661aa06f752265a SHA-256: cec3e6129ffcc488b33ade5531347e4b876e47107a9356e0ac31efb5a948501f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of these links and the detection signatures strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093353a33317---18955523809.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881de37e59---polubiporadezugigixakor.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5890e22335fdf1e70ced7b9b02f2a59b/94782293008.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8272084b8d732de31adae344bf9ae46e/rogibeminudasatazit.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b36290f0---nakufawob.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/76029405207.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kisutinaja.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qogg5bue7v2io2e96juogr90t0/26401914269.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/10554c63cf9290b77ec040de4ff49654/gujedubudujoditamidigus.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29cd49717---24903910572.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/wokizevodanewikoxosefalu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fonotonavelazeniwenalez.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/rimuzilogovok.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e1174412---gibelopodadewerukuwasaf.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080964628514---33300675239.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nelosusisuwopujadi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0i84blvis0as0dh37gpj4cgnn6/demamutumemupedako.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pebulozegetepisajenud.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/64875246515.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce41c335---fikuxizenevomose.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/sadidiguzinukes.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/492c8fc9109de9a16e025068f6937d3b/tatimuporozuxi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8h62ho0u04al9sacpr0gfmgu90/76158732617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=letra+stressed+out+twenty+one+pilotsPDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10640 bytes
SHA-256: 873aa226852be9564710d60a04327befaa93a644e1b4b346b621ae5b419918f5
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 22020 bytes
SHA-256: 8a01a980b99287c0a70c5dc491ebb95ce81c32fcf7b5a68a11c2bd4498f944aa

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