Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ba07df03eec56…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 04:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36de2eeef2b6be2fac8dcbefa18af77d SHA-1: 874faa4bf7cc39697fb5e3c96dc64321f86ba84c SHA-256: 753ba07df03eec56ac71a113a69cdbc13922d66b373d9953cd50d3f570ee2e7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607adafc5def4---xapesexam.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0ad49bc5---satajumupepatupepig.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gekonugigejajun.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/43322240431.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/88cbc9c1658aa66d19ccd36c56ca8883/fetesikap.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e36d7457---8165273903.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d03d2d9---tetexatafenelalikemalewum.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sofuzamiposiwese.pdfIn PDF document text
    • http://consade.com/userfiles/file/tilelu.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/megapegaje.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/bareni.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/vezikuluxofi.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2ca76893efe0713bbdb31acadfde8fb9/nevojarodizuwuroronobipop.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c8bcf685---durarepalefamotizeziweb.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5db48d249256f857b744feb1bed37571/kefenimatirofivu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae7e152c---xinibisoxadab.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/98d070afaa3ca5b352c96e9569a7e865/95562938256.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff111300f1---2881067421.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cea64fa06---rinevowakulawigomokon.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/63258263384.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/05d3f38817beee169914f7bf6a2c3e28/diveseviluworakaleniguba.pdfIn PDF document text
    • https://educhina.mn/editor/files/72807805444.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/oqedaturf65gvsc790gimqhkqm/ruwazogalunafogido.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/12955950198.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/66262337a6d8a43650a2e29792f086fb/18849930537.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecebc7214849b457b72c44252864110e/nugufovetapusoxirabudaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=note+making+worksheetsPDF 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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10664 bytes
SHA-256: 6db6803a371f8c064be011cf7df49a72ef6f512f9e1a50343081b24fc00bee76
font_02_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16964 bytes
SHA-256: e02e0297396175ecc8295cd9ca0a9b6a246fe93c6cf76a3b747c387f84a5ea16

Open this report in the interactive analyzer, or submit your own file for analysis.