Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8c6303e8341406…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 02:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88ef8273e8673c28f96dda24577f3d1f SHA-1: bb6c502ae4aa3c5703089e5bd094b61fecadb681 SHA-256: 7f8c6303e83414066d9e385ffb7428ab43371c77edb7da4895111623df1f9a5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to redirect users to malicious or phishing destinations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4i4k77einelob2ckqseat0mj6l/xomiwov.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4272c2bad1---depelakilalokaf.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/94316789885.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b539e597384---xuxomekuf.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/77201572395.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/82450459045.pdfIn PDF document text
    • https://777mto.org/contents/files/72658667895.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/112037375695.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02c90cdf9---83325966363.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/susurolupolenera.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uc1mndp7a9os0or6fi1202c797/jipuvena.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/kuwux.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/kudeluzumirapiremula.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/lomodozovovu.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/74877705044.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607951502fcf3---29091012870.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c9243fbe07bf2a9287fc7162495b97a5/9549322109.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vd36dqar95p57t1pu96kub3i9m/vuvizakido.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de6d4e007---4680716634.pdfIn PDF document text
    • http://koddous.com/userfiles/file/98687711221.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/dunufaruvolupike.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e166df26b---juvojivonu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/97399369405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=medical+school+personal+statement+examples+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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 17284 bytes
SHA-256: 6db8a30f4854c4187d7a12545286795b6205132812d70fa33e29183b2e4e661b
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10980 bytes
SHA-256: 62ee502866843423fb66b926a7ff59623e98c1c5b739dfb12efe35042764e3bb

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