Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bcc853f30b8500…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 03:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5ff948914d69865933e6b954e76f5e4 SHA-1: 3b983ce3384344735d1aa571ee13eb8c0120b82a SHA-256: 25bcc853f30b85003fdb8f96df16f535e49ee23ea15641c1474afcc2e0051f10
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the provided links. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • 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 http://marsalanoleggio.it/userfiles/files/mewufonijulebulawovaxabi.pdf In PDF document text
    • http://columb-sklep.pl/userfiles/file/nawerekuragarinazeke.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/tudedegaguxolefixuragu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/090547542241.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/90985250652.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c66721c---51620526751.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/favapupagumedigawavelo.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/3976562717.pdfIn PDF document text
    • http://aquatherm-graz.at/files/59235539065.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325b9cbffe3---kukoveweba.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd009cd1---12315092014.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/29526562989.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/bomawopuvanovimasutelum.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/92962972380.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5bbbe096---68227017852.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/ratusipojegunovenobokugur.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/95964503187.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed1c4f6e9---19022676251.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/doxiderasuwudarofovojo.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/60928047424.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xekar.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/lotubamuvafup.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/21046113734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=grand+auto+vice+city+apkPDF 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_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 10704 bytes
SHA-256: b4e9b713f85e905121d201d07102b17c6d71e9a705851086b154d97e1ad80109
font_02_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 16208 bytes
SHA-256: 8e9e8cd49af3806ef9c81c586aa698d76929f2f370a00d911f350d9d4b8d178a

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