Malicious PDF — malware analysis report

Static analysis result for SHA-256 7405551192b85751…

MALICIOUS

PDF

93.1 KB Created: 2021-06-17 17:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e2442765bed6bb0d072f9d33aad5892f SHA-1: b9dbc05b9e19ed2822f75f327ba1bcf9ba9eadc4 SHA-256: 7405551192b857514f85e2662f3527f7c37ae7d0537518dec77dad72366d46a1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or phish for credentials. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ad5f10fd2c8f80b6eef2bb348180b839/44822754873.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdeea227d5---tatevezejudeboxufojonupim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819cfbbd2d3---vezazupoxexurulizisug.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnf55oq9qdfod0bvkfl0n5m3n6/penasuvaraxivelolura.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f9320911b8a1bc09e2dda05dbfb845fa/niminagobe.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/eb309daf05fd78f515ef59927f818084/xezositekepiwuzijuf.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/77085593132.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd5592e61---21271789431.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160805c15936f4---suwatalalubupop.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0c3fc65---gezesipoduzojunal.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160757440daaa9---zofefatikipibewibiseva.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210513224756_632071183.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c0440cd4---gokapemoda.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/45815442987.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/60832942595.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae895896f57---82366889326.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86373761261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=creating+infographics+in+powerpointPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 5148 bytes
SHA-256: 79bf7e7042649832bf20b5a902dd26bd1bd5d368fb68a5bc9b931d4b5ccabe4e
font_01_sfnt_off000134f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 10588 bytes
SHA-256: 737a6b77898b4d463844ce18dd41bc8356a1cbbbfbfab8e9985a232231907b34
font_02_sfnt_off0001593f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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