Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dbcc2562441f9a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 22:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f8cd286132d0d573366a1595d9fbd494 SHA-1: 015495dbf131511aa2fe48c1b1e5af71cf637c1a SHA-256: f7dbcc2562441f9a781aacdbc212282e6873fd7ebb941d1bd5e1fb232b0caad7
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 identified it as a link farm, with numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/696c3277295ecab93dcb388f04fced66/pekelawuvax.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24822320075.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f824366612---14454776094.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3p06c27urbjcbfckeu50ff0g22/mevusekexobo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/glas2b1h8q14ccrud337rd69o1/lanomupuvuwevunujafu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/97lj0b4s9271hjtci068un7bub/40284363528.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3a9485a3---fekadi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/15l4d0tgruvcq6r4omr3mequu7/30268868477.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26238570120.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/34205652886.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e85ec4f9ee996cd2824463c0d9c1f396/bunaniwus.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a2e2a47b---72057617491.pdfIn PDF document text
    • https://everestart.com/images/stories/file/ledog.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vatawupugi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/44010472335.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7afcb4d1f28e7933a8c5d6050ad9d04e/xilesugoxutawibuwipurutan.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/vatujawi.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/31060247135.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jiwanobowolezozu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18d5f592---jugokedepewiwada.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0acedf758---birireworadunov.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a16a743f---19669058052.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bb857e3418129a3ddbcc5598feb2f98d/18415184612.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160993cb6c4485---gegozujofidisadawe.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/725def4880f19dc6363703ae9e064063/gilekudixalod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=early+trading+hoursPDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 17168 bytes
SHA-256: d291f5195fe08344d631d111c5a03108136db12a9bd5a8ffba0c3d0e69d4abd4
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10592 bytes
SHA-256: 392877abbce5bcbd962135ed2b3e8ecaedbe3f28abfda44ed18f1eb843142755
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1