Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8dc3c47e0a3396…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 06:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3728cf239702f9eb7fa87c0d53a0d983 SHA-1: 132cce9469573f941821e30e45f468b56c5f1a58 SHA-256: 5f8dc3c47e0a339610f7b6315274034474d20976a76ee5e726e73a1e32b561bf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://remini.hu/userfiles/file/lefovereru.pdf In PDF document text
    • https://raovat72.vn/uploads/news_file/dawugajasuveze.pdfIn PDF document text
    • http://handgun.ee/media/file/jegilogit.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b5f98ff6c019029142cfad9b8ed8fb54/68759716869.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/milodado.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/nubuwuze.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/24924836885.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nsc56gulqb08t0iabp4pc0fpcr/tufatozokozojunexu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/2354329658.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///86669898237.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa06275626---98307594467.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/59285971065.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118be186a6a4---82818729077.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/35343131603.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lebovedokinejemujo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/35222640117.pdfIn PDF document text
    • https://ptogel1.com/contents/files/74129082197.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/gawor.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9846f43651---24852503151.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9ffee8b58---dibimoxolitobavepirev.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/foboketoza.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5p8ih7tl0cgrttjsaifcko1214/mezarotoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=positive+affirmations+for+self+esteem+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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 17300 bytes
SHA-256: a9203ebb0e57853ecbd196002006c59f9db56f4b87126c5b2a8fee3bf8de8388
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10724 bytes
SHA-256: 6753f22731cfb43bb25d9cbc711a283e05cfa461b3850852ae6f9cd7f68baf28

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