Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec813227f2ed7f4…

MALICIOUS

PDF

103.2 KB Created: 2021-08-06 02:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed9189fc78a09349961a970f7a6a306e SHA-1: 7b13db37077673fa4ce6e139bb4085ecf1f2ca75 SHA-256: 8ec813227f2ed7f41831f9f3155de4e488a5ab885f42e725db64a9fe27783b7b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde3a5c70c---50478570352.pdf In PDF document text
    • http://kengosushionlineorder.com/uploads/files/1360264757.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/19866974097.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d29ccb0a---gedaxi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbadeb845---97863465998.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/14243560296.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/xomininisile.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/umrets8d2oaval12o0v3mf5gc0/43453736253.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/roruvos.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/nesegoludimoniresosem.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f08d3e381ac---57679857017.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/888e142a03cd656c96232dcf6518c9ac/75902413582.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/xakaw.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/78453373882.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/nezopomapuzobo.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/54048701094.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/567mvin3u5fpc8hutuck1rseiu/21207382596.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737bcd158f5---31309796511.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/034b2b7ce8948535897ceb3e796de49e/xodudapinejarixonamuboxu.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36440474083.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fb4de5e412373ea3aa08c61506e1fda6/bukeburujo.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/bapaniguraturatefezuwe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ec4aa85f83db9e076d960f52bce12bda/bijafunuminumovukasiduz.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/satopozop.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/kikojikujutitebopik.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/15d34fd2b106a75021b98060a596b333/kituxila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+strength+based+perspective+social+workPDF 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_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16696 bytes
SHA-256: 42e2351b903e2035df9db635ff9f8bb17316bc3df889a9251d935efee16280b1
font_01_sfnt_off00015c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001741f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741F 11168 bytes
SHA-256: 34d2095ab3e991d238cf744079d29ef6575b1a1a218e838437cb0f29b7993b01