Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436d9982fa46431…

MALICIOUS

PDF

82.5 KB Created: 2021-07-01 18:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c556a3413d36f82f2783fda3e8dd3169 SHA-1: 2e32cb0f43e8eaded6781bda644880b325aa99af SHA-256: f436d9982fa464312947f23eb3e78e360386b37efe70ee6a2b06063fb5acbd01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://assytekservizi.com/userfiles/files/kexusigojijedanupebimijek.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/03376c2b1c8b0984e4ccf16aa31b6c4b/galipabevurobi.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/pukukunobukanemetex.pdfIn PDF document text
    • https://ismart99.net/upload/files/nopenepazokufufozaxija.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98a2a586c---lejusunogagig.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/36273001294.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5eus3459ujhhejurbc44cmfl8e/15706578802.pdfIn PDF document text
    • http://toonesk.com/upload/jefejuwokusuju.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c4e2d2ca---xaduz.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/812cb5c771a5534a02c01cdfae040d28/70295635629.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082499e342d4---19709674046.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/werutijinibixezi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d670a7c2d5---75213999712.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dolowo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n84ukm0l9tl1pcd2iblkib4hva/bovonigojobuzomufo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089834c820b9---sigijirabulepovakefesiga.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/nafeluzaxabelol.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/12b074e1c35d99d5af2c3ded74cc4e53/4060310223.pdfIn PDF document text
    • https://rajaunited.com/contents//files/wuzaredinapizosunagebiwav.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vudutomoxonititiwop.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/wirokux.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad9d011ad---16047226446.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e84b661fdd296d3e98c105ade09d752c/78806475743.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaf17f286---7628018354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beethoven+bagatelle+in+a+minorPDF 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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 20380 bytes
SHA-256: 5622b21d03721d9eac2cc4cc1d8b866ff82f3b901c2e3ed0adbe24a1664b4adf
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 10648 bytes
SHA-256: 637f2d6883badb636a9fbe2c4660c0b7c896b2f14a495a2fa0bbe3dc542afa48
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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