Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff87e4421cd82fe7…

MALICIOUS

PDF

102.3 KB Created: 2021-07-20 04:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 809a1cf737d1a4eddfb0aeeddedfd281 SHA-1: 8d2b39acb3f245c285d5d640107dbdba70c0032a SHA-256: ff87e4421cd82fe7eab4d59a00cae6876d0e6e74eb137f1736f212b0bce9110f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs that point to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farms strongly supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eece6a7767---jawonoboturubalazimap.pdf In PDF document text
    • http://rcp-ranstadt.us/files/ziweduribugezolo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/verirejijaxejaxa.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/dasatavuxed.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0064193b---dasoxopoferuzosuzetij.pdfIn PDF document text
    • http://silmalogistics.com/sitename/app/webroot/uploads/ckuploads/files/2279623606.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5os0t08aqkboi3hu949vem6bs1/9191311225.pdfIn PDF document text
    • https://themalc.org/files/file/lopogikotabulemu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7666801c83---reduzetit.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/desubot.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90e086017---niraz.pdfIn PDF document text
    • http://www.celso.org/download/sivenesosezomugevolodot.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/naturomalunenixizufelo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/29082929005.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zukubub.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e892c8cae---44428723368.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7d61970b196ce10dde5ca8103d93b523/61209399827.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/lusovebo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c0087c296---71391084333.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jezalom.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/xututekedunujusaket.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b14e325a8---ruzatugodo.pdfIn PDF document text
    • http://lukinserv.hu/file/99483083673.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67768069274.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077898254b0b---gewaxofobagezanazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=four+types+of+tropismPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 18872 bytes
SHA-256: fda1bcb44a4baac972d5567b2bf6a59ebb6f910407c27dc28014f00d6f945b06
font_01_sfnt_off00015c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17451 10400 bytes
SHA-256: a976961f84a4284ced3dd5435f10884dd16115ef881cfcbe8381f6b9ee83ba26

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