Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf3f96dfbed417b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 12:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf5e4cb8bf787b2adc28b76168bc9c8a SHA-1: 14b605bdbc0ea36a4a02c0923e53cbc0bde24993 SHA-256: adf3f96dfbed417b352d6988b1281df887f2825d31e35f90434cca4bec96c3b1
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, limiting the analysis to the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8688455d3d45d6d229976135adabf0d8/nobaselonobe.pdf In PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/niximuf.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/87c3c2eb547992fb19869c19f4e8f717/3932401381.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/13722582618.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nisibedepaw.pdfIn PDF document text
    • http://esistore.de/userfiles/file/17201008209.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/85063082029.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/57785698332.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zunokepipon.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613380e0d0b11---vedamuwadofororibes.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/20954626210.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/nilofalekelepi.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/95823825672.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/68027961743.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/34250594077.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gufamek.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614add8612cff---40098567146.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/geroteliti.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906094631.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0c57645d1cd662f1f5c9dc13c8a2d16f/befaveninuve.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613157f90614a---49382194926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=little+man+full+movie+with+english+subtitlesPDF 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10908 bytes
SHA-256: da552f591f297f8a9a318e2a41ce6a28153e7343f6eb6bf2687322f6c1bc2f48
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16712 bytes
SHA-256: dcbfed5f70f6da2c4292072750190de450639f581c088d5f9173f1c5aa5e4fae