Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee756dcdae21645…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 22:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c220ccd8815d0fb1253ce08e8d28a727 SHA-1: 0c1584f897c38e215a97d49a23628270c6f7b5e5 SHA-256: fee756dcdae2164541aa51751113f24ecec5309177b113b48e376e3d970c2bc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to link farms on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect chains. The embedded JavaScript, while not fully analyzed due to its nature, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7f765c240ecbcd2a3a7f0cc4ca83faec/10343606829.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c6a2f807---6299732087.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/detol.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ineh0kb9pu7q0h80c5bs5vp7p6/loxofaxomojone.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/jitabuvud.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160775e765e10c---bixagapujesuvipowuge.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/25882732031.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28816810909.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/81478541786.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b20cd475---51508171912.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8938da98c---43473379170.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c33f06c72---moganolojafofeniwar.pdfIn PDF document text
    • http://waterreducer.cn/d/files/43553703441.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd54a11aef---sekixak.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/37114304555.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/dumajuwefesirikomusobe.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/136ecbec573b49fe0e8ae4d4f596dd09/kosidexeresuvirogo.pdfIn PDF document text
    • https://jetaime-shop.com/files/13578051885.pdfIn PDF document text
    • http://expresskaliski.info/file/wojadiz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fe3c230335b5d9536ba604a236cf8e29/84038885018.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160822d0dea90e---xesumeme.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/63063485322.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c4b05131e8c49a68d2735388ffb559c4/xibutupusumow.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a19152c5---61589674470.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/9c7lbc4d1t9mov2anjt2sjvtji/gajivugadinebafom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mansion+del+rio+guayaquilPDF 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_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 10680 bytes
SHA-256: 180340b1ed680adf57100bfeb732bc3ad8ac4e84f8ba8bd63c2090ee5c88cfa2
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17584 bytes
SHA-256: d32271899ac0d327d638f336c046792003cd125024bcc3237b6871728f246268
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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