Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad87a106bdf5647…

MALICIOUS

PDF

80.4 KB Created: 2021-08-29 10:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23eeedd1a81240f84003c5810a73425e SHA-1: bd5ec4c6e1f0471bc2b5c9bbf23ee8bf778a08e7 SHA-256: 0ad87a106bdf56474b919cc5797529fec4f8e39a2ff3c00683d71767eec7d39a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ee2b302---lolevatiriraxi.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad1c63a9ce---65252894950.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32983534110.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/4705963255.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/09d9ea96cffc01971a57c9b9e5ce7be5/nufirorig.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/dawepefiranubovufugonep.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075626a96c91---lasanupejanigatinel.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/fezomiberiwip.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/wadiw.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xorugiwefavamazovide.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/nepokotuwevaroxidumibemo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/11500419564.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/17e5a742bd2b421ce5be9a325bd6a16f/61358209026.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60EFF5B6A23A9.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/veroxux.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/94280411058.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/7198084478.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kobagudi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366a75b726---sodexovibura.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ebee3561ce1fbdac7d49cf0181c62435/24096672177.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/bozunawagabuwipuzu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad815d5f27e---dumatebazoxusepaligutes.pdfIn PDF document text
    • http://artediapharma.com/upload/files/lowisokuzilosaxedawu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6jbgp9q5qdqoaal7noe07276kp/35330256493.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161264426e5c6b---vodurabetaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=getz+owners+manualPDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10460 bytes
SHA-256: 37fd24f27d1461cec097ceea1342d3f9696c6cbe66513518f7c2560e77854b9f
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16192 bytes
SHA-256: 3a9c5450756b941f62076763e424f5801d7258e136e91fa802e26a320a18972f

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