Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce75adf1ed95aef3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 15:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11dec84d76144058faf2c4985f4b30bb SHA-1: 03fb73ea9cf1bdafa51e34a3b6662de8c1d47477 SHA-256: ce75adf1ed95aef355e4ebba4e6003f3a23c5d3c84e247714b6f311e56e1aa8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kehlux.lu/userfiles/files/tadavonedi.pdf In PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/fugatesomimodofet.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/32369969902.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpf5rjbuhvrka0l523c4231lc6/mumonawebodediwise.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/81485049099.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b82587f90---linulinipudilivon.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/36312552457.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ee70169e1c9d19ad9c7c1f3016e50abb/metiguzifozu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ja5ks974h2geon4ujtj7e2ob9a/jaxibazerovuxevosom.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wopobalep.pdfIn PDF document text
    • https://hirurgija.me//files/lajupitila.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rujufometum.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/m0cafpcv7hdn3d1okf61tc06qg/zusosapeliwukekazat.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/5991108716.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nlcn4lqmu3qditqvc7q37j80i8/vamobes.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/vepixivuxaxawe.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/vagofajebefitevuvaxisasoz.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/nevejobibopobuwa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/47abc616ab08dafbaabd84730befba8a/fawixemasawuretir.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccf7de4facbf9ee6b5f64b6dc00119aa/liratemelusoje.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/51953639205.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2744bf10f---puwexuxojokuwedolewisekif.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/185683846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hierbas+aromaticas+del+peru+pdfPDF 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 10908 bytes
SHA-256: 290993918930ae77fa1c20e87305471dc6f11f2c97e91e077f9f096faf48b7f5
font_01_sfnt_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 16784 bytes
SHA-256: b3466808c456469899ec20ac0f42f86f16b87c7ef369a515f9f2ed040b117af6
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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