Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b6ee4141a3dbf9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 02:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c742ee7b723db4ceb8e777623064af21 SHA-1: b21ac43df16473a186c66a394a24ae382c7f281b SHA-256: 40b6ee4141a3dbf9e2bfc1691ea2bcfcb6f715e4d23ed5db3728fcf54c2fe8c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is used to redirect users to malicious sites. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982db29e194---pazolupa.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16127078feb8bf---73381836959.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33410007444.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/61835330101.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/53930344012.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/kogifajovuwo.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/tixisikodisi.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/84631138423.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/61468508370.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ramovusesomevomubo.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/favalesesirubobuxamisuge.pdfIn PDF document text
    • https://ubranni.com/uploader/files/49851080512.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0103c0f7f4---16453277996.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/97970837744.pdfIn PDF document text
    • https://istanajp2.com/contents//files/75703719296.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b0d60be67eac732b7b9aab332568c23b.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/97306177625.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ae4987eaac8523afca1d5f388fd6e023/87719994986.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/62433725075.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/guguzuzusagosuvutokor.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35e137f45a29f039831f79999ee93015/wipuwaperixinerom.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2ff12aec4deb77d7a9ea1cd1cdc3bc3/zedisuvavetajesufalele.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/8291490837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=flames+of+war+pdf+freePDF 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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 18476 bytes
SHA-256: ceb4fe6f659708375e8be49252fa8f20291dd2e24c0db32dd19999fe65e82dde
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 10428 bytes
SHA-256: ca7f490a1160e8594ab5a8a7032dcb378f7e81e3c74c3b9bc9c5c3125ae1a5d3

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