Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e342abba48ec15…

MALICIOUS

PDF

115.4 KB Created: 2021-08-30 19:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0aa12da1425fb67e8c99e0a24ed47bcd SHA-1: 7f968d72bb6cae665515a6a07d6125bc101fa19a SHA-256: d8e342abba48ec15f916e4bf6a64e45bc08344c21fdf5f858927d57a87c6050a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the overall structure points to a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ebooksweb.net/files/file/2698558167.pdf In PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210623213824.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/metilik.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vegezogegukavigoja.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/odj89a4iv4ug79nvj56uu1r504/88608606371.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ba9a368f6a640fcc1795fc6cf62dc95/8929358793.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/87747384595.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/85380581080.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ao3l6pigfk6q76ueslebdbpa7c/71808474131.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c51980fb44---42436902951.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/60827680888.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e601db30f5---59846481250.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/28943461121.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd314f33851---vadimisapipedepubipo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/sodelobidag.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9nu2hb85ljphqtq3vl9g7gn3s7/32968124346.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/i6c2o7b29iuc6484spngdpmoto/xopapimuxogezimexojamuwe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee3ce7209---suzosuronewojuvo.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lonezoxataxokupexexur.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/51255031693.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506093637197508.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/tevibipevifijitixisakeras.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/finulatata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+2+houses+of+congressPDF 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_off00016213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16213 17808 bytes
SHA-256: 6f1dd4c873584dd2f550efcf9a16f4272eb4a65592166dfbc658428d0ef32e25
font_01_sfnt_off0001903e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903E 10400 bytes
SHA-256: ddb2c7327769bebceb6a0991b97657e5114b1d102d031631b658fe48461b3787
font_02_sfnt_off0001a7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1