Malicious PDF — malware analysis report

Static analysis result for SHA-256 12054a8cf9c55370…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 01:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9654f70e57343abd4d57076998c6edbb SHA-1: 069cd6ad1b95c25da2ea51ed461c1080a37f5686 SHA-256: 12054a8cf9c553704bdcb22c4ceb12cb3d83719bc043b8686d612413ed1f2991
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=rabbit+bubble+shooter PDF link annotation
    • https://muratay.nl/userfiles/file/16528183962.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/63552220920.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/24958340209.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77e26cb38---mifezesowuru.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/48093828232.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351ed386545---bejutosori.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/xixefilemotelegojog.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cc13729f6de480a8361667a3bcea0/41915317572.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/29901463490.pdfIn PDF document text
    • http://chinazzjx.com/d/files/17464631006.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/89889994039.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/menexowudolule.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/50667350632.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/tifotabokusek.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/tejegagizupi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/16635378711.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/67930714555.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/41263324919.pdfIn PDF document text
    • https://profesa.net/userFilesfile/vukedamenogamovidigomew.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/defelazuligisijolitabuj.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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10388 bytes
SHA-256: 883991813222723bbecd28e75de17924b2ef42ee7ff75b22e336d619143f616a
font_02_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 18828 bytes
SHA-256: 67fb26fda175013c67fb86cb6c3d34d38f839b50adc68d42c0f6425ec6c08491