Malicious PDF — malware analysis report

Static analysis result for SHA-256 373307774c5ec817…

MALICIOUS

PDF

127.7 KB Created: 2021-07-26 01:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0285342db2c548d0d64bde3836cf2170 SHA-1: 68d70ac1c19438e207fdc413aba321e93e07c6a9 SHA-256: 373307774c5ec817887fa8930f69d2edcee0a2ccd27a14080a8de10ba6003cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://aedwea.com/upload/foto/1354407794.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b39c9b809---guxuxelojiwavofek.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a60adff51---gofupujibuda.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/vuxikij.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/26373463238.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/ruxexukesifaz.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce5febd8d---bigebiboladiz.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/3642230250.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kolopekalakosunu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a400f2ea2e9---nifajog.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/61200948566.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e94c00374---35671455464.pdfIn PDF document text
    • http://arslanemlak.come/file/fowanipobebewixogut.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jlrk736ggp6747p170jp7vvav7/92206975385.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/mepuloselimanof.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/6587599365.pdfIn PDF document text
    • https://xistenze.com/files/files/76035208620.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9988783b3c293e5b6edeb7013c99be15/31896921143.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f933026d6ca---vevop.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/63194792832.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb55d0d760---toxuwopuvobe.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c8960a59f2837a5e6f477b991e19e52d/vunexupemefolikulub.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40cbf908b9---rodaburisasadelaf.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fipikulasokifenusawefor.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0824e6dd3c---90525713818.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pdj6n0l4bp3g72ij7oudlir466/jasutokarefatasufakaruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=animal+farm+book+summary+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_off00018ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFD 18248 bytes
SHA-256: 3f4cd34bad5639418154f8757ea07a59ee42f8a0925aa46737f34da5d12b192f
font_01_sfnt_off0001bf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF64 10856 bytes
SHA-256: ad3fac2c98d0e9984f00837769e0bb63b0a312939868cfa17fa12fa2bf962dc6
font_02_sfnt_off0001d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1