Malicious PDF — malware analysis report

Static analysis result for SHA-256 809103fdb5245e2c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 13:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93eee8232fa7680e97764edc18b95ebd SHA-1: 02d107dc3c6495cca6e55233d813905eaad68875 SHA-256: 809103fdb5245e2ce7b8bfe5794d369b65d506f9940fea10b18fa9e6cc82bf47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://jafra-com.at/userfiles/file/64456110951.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/439035e11cbe4931ce1435c6b92fe756/61719706504.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ee768f522bede0cf10538c545418fabf/24497661149.pdfIn PDF document text
    • https://jurad.eu/files/file/zowosilujubaworimat.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/81375575314.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/58952055742.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1a122f34---30129753386.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/konixixox.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kerikasibizogutirepid.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/72680389357.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/26435989178.pdfIn PDF document text
    • http://52963566.com/upload/file/202108220619480839.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fafc9e13a58b58bd2ebf4b2a57d27a8a/xaxumulivakumisukaju.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/36869191108.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7d9dfa53688ac22bb6110631b9460185/8091581750.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3e45b5ae---94545608450.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7fb49470f81972a776e995f977ca3de2/kelogejoma.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/91641436683.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c24e477cf6a2611aee7103d611b46211/jaxasowe.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/49529722228.pdfIn PDF document text
    • http://ezibra.pl/upload//file/72826788452.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732bb17353d---16693862432.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091a146a045c---64161950794.pdfIn PDF document text
    • http://absigorta.come/file/fudemas.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/66605181907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mit+seaperch+construction+manualPDF 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_off0000bfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 16548 bytes
SHA-256: 2fd20acd202a48abf4551616f9105420e882a688c614fe29820613cccf77153e
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10732 bytes
SHA-256: 161979d888a210afb5d760f4a022169aa44b52d9e305ac4fb3d22aefc551158f
font_02_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1