Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb19b856acea753…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 05:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41ba64940dfbf9b0429b7b109cbf7cc0 SHA-1: 5deb0a27c67a8f4890d2d828682c6bb555589249 SHA-256: eeb19b856acea753b6f4de7960c937b4c0fb9615396cd0227709de184ffcd1fc
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the detection of a link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a21bed6c925d2165a9b4cc768959faa6/mupikazuzegud.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/pafuvanurupato.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a8bf2d4744b3e330377f4373a2ce30b5/fakisutukadu.pdfIn PDF document text
    • https://fallsplat.se/file/webopojab.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130493855e1e---pokulagetotajuno.pdfIn PDF document text
    • https://thepainter.asia/upload/files/79270402045.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e51410196555a0161fd4715b4e311af0/67192138289.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bd24e12e---ruwugixisivosakesidu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237e96efd0e---9394487212.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/posenosapebomop.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/domotokurilisunoxiwuba.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74055024620.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7anjhi2c1kl8jtf9si55qhnne7/zefaradodab.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8468616ede---92160762481.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56a4e9c35---nutigaw.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/gusabibetapisutojumut.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/66748146332.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/denuvilumowivorutit.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0dd273a3d1daf934098321f0dd6866b2/10496908042.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/q3cbqo2o0o7srlrd5dbmq271r5/43760696333.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5146623fb1386150375b78c7c2b33/36994111266.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626097011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+defrost+upright+freezer+costcoPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 11052 bytes
SHA-256: ac9bb0a74298c450e58e6c2225aa98c66a3012731b52c87a33dbf15d3b66307f
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 17600 bytes
SHA-256: bcabc32e07ac82f5d6a46e71b2a7ab116bd0fc8e46a84e874117f266beb581c3

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