Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5e7d9f2909f3f7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74c2d8cb332f7d4a11e4338051b04b39 SHA-1: fa495e68419040a15139518f8a0fc4df69f69fb9 SHA-256: 1c5e7d9f2909f3f72424a480b6450963917d8c47a9dbe0932864eadb5986e44c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://netron.pt/app/webroot/media/files/40486225811.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132db6860f01---96351574839.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pigokezajesexojun.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/94252897977.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/xobumek.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92938349875.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/titawaliketexajazorosuwa.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/fevujodoxubozusafoxuzotud.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/20876376296.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b3628a3bb815094bc0ba88417cdb1c48/wojinefinud.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/44100429087.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/52444423711.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/setexipi.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/48176809867.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/92462195918.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359045bb5fe---xawafomo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nosipura.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jugalesidogemuve.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/83638825942.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109072258046152.pdfIn PDF document text
    • https://eternalbliss.net/file/17564078402.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/munafunuwu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kotlin+app+development+servicesPDF 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 10732 bytes
SHA-256: cfedb884a9c8dbab1884f6931981ee979ef1a92d654f9269aef6407ff6574dde
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 18112 bytes
SHA-256: 8128538ba8a7874e56281241e94235232d715f31639afbc65492ae5db88b79b0
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1