Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daf0d6ee8049321…

MALICIOUS

PDF

84.6 KB Created: 2021-08-24 21:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 22b1ba9e99a1d86f27eb585ef3f9cb50 SHA-1: dcd11241d79a8b17e10bb19b7126c1ad246d08f9 SHA-256: 3daf0d6ee8049321f586820ee4e3ccc670319b5489b134030e96a20ad3fccd68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites and other disposable domains. The primary attack pattern involves directing users to these external links, which likely serve as phishing lures or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://krisoc.ru/uplcv?utm_term=none+of+your+concern+meaning PDF link annotation
    • http://vodnik48.ru/content/file/sosikedezugunoxuwonukav.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d2e6249245b1abaef3e48911551400f1/viwezikaxijosi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/88392277439.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b4220d0a---najefudobizo.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/tasapapimamaxetuk.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/petoja.pdfIn PDF document text
    • https://noddy.nu/images/file/sutodevanagomedowezula.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e820c824c19---48736225866.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/47332878996.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52ddf062bb---jodujano.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/dfj0jmkdpmt055f50iaoqnh9r2/gesupeniji.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/subujanitekobo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xisuwenada.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/18779292500.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/8044293508.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/67122999399.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/73043627844.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/51858406919.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mgiqs58vaap360lumku3l2p7tq/32350826081.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/93d2849b77f5187709ea9cd916472555/91724287468.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/86973204000.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16120072a179f3---doxanozazosax.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/jegirelufumurivov.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/badeleneridase.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/sosov.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/pujororuduwig.pdfIn PDF document text
    • 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10556 bytes
SHA-256: d670dd68da3f4e89bfc3f95e66c343333513072157802a95ea846917504d970b
font_01_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 17816 bytes
SHA-256: d645de108517296ca994af6eedee0077fc44b0158ddc85cbf1c088b7e090dc32
font_02_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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