Malicious PDF — malware analysis report

Static analysis result for SHA-256 b895f9bed1150111…

MALICIOUS

PDF

102.4 KB Created: 2021-06-27 17:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dfd7153dbf2bf4bfab09b15b9ec40867 SHA-1: aa17be4a2f536d0963c2964ee4af3548ba8a8235 SHA-256: b895f9bed11501116ddff96c3cad07b2f011cff03b5478662cd5a5a48c43de4a
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites and potentially malicious PDF files, likely as part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=murder+mystery+game+free PDF link annotation
    • http://mytmbc.org/fckimage/file/50532725641.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bij6thashf63mipa7vsfvllm52/kekavewegewuwowivaramule.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3e831e16---85048469136.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/62754be2f3a5d755455cd8cfe5021391/30941198406.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qjosgf7jvtt9f9g5fuaj7ek7f6/24192437198.pdfIn PDF document text
    • https://hgb.se/filer/file/93109077815.pdfIn PDF document text
    • http://www.toptehnik.si/images/48220332286.pdfIn PDF document text
    • https://olterus.com/contents//files/83954575094.pdfIn PDF document text
    • https://ancoraeducacion.com/images/85477957857.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b392f17d0b---nusefirewegidikupe.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vimofumukukigifisomapimep.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/99528436926.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9679273d2af7df69d8f5234acbf2d334/78610234543.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f747fd898f---fexuwojarovivurido.pdfIn PDF document text
    • http://jarosi.hu/files/file/zagusugizikupalavilox.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/55439501468.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i2t50juv2k4eneucdhdjhlc5sa/90859395004.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf625c085---6826682660.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03b5fd7cd5a316e7386f51fa0e5f71c0/dosilazuteburepebuwovup.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/bewipebop.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6470b8f19---5738772265.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8pslqnbsivgqa3rlj4ol0fsq0/88087069834.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/kugudosok.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5feb66b8c---nuxigiwusu.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_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 10544 bytes
SHA-256: fc26fa48968e72a13561b1d144905d25ae3c04c38f76c67991e677ce75a6e2f9
font_01_sfnt_off00013fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC2 20516 bytes
SHA-256: 3b60263716252b3a576e152625432ccc79cd2b4f47bfbb0af82580f41b24ea3e
font_02_sfnt_off0001745c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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