Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b94da26eb3555…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 14:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a786939ba1a07de567bf43817cfa2b01 SHA-1: 3b57f4142675207515313038516838e910f87da6 SHA-256: 271b94da26eb35551af9bb2c98faaaaa383ad23ebe8dba7260076b84d9a663b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This pattern is commonly used for phishing or to redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://fanaf.com/article_ressources/file/38372756838.pdf In PDF document text
    • https://dm288.com/slicice/file/86626199916.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/10959448981.pdfIn PDF document text
    • http://temple.mo/userfiles/file/suwimuzuseravevog.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/maronalikofumamafazoda.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/pefozutarovu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/25807464783.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7iu3b7guvntc42pitua13399vs/64168041940.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/zadoba.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/29924176348.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/873ce381cfbe75dabd3053f7a2fbc851/4180136405.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/64288627660.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/22111378912.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/90917376415.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609413302b7dd---jezazazarufiwoxu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/dozibija.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a651137f02d---poxusakod.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/fjlp8ve7p0uv5g13mec0gsosdr/39753634428.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/92758544367.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831b2975e---dujafag.pdfIn PDF document text
    • http://zaiger.ru/img/file/dozemerunigaxireg.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb8231adb---roroxavifewopeva.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609668df2529f---zinidegepo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b802f267f4a---10058535447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hydraulic+system+principle+pdfPDF 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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10868 bytes
SHA-256: 1a87a67afc0044cfeddbab6f79a47b51345dd748bf69b5b69d7d3007de669a02
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16256 bytes
SHA-256: 5c01898146bc2b877fbb6519ac30cb5e403f17a71befcf5e5a6dcdbcef97cfd3
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1