Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b889724d1741ee…

MALICIOUS

PDF

77.5 KB Created: 2021-08-29 14:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fbd271580d957178a6333130e798b5b SHA-1: fbb70771f8de2ca9d71caebbd6ed2200963b61cd SHA-256: 37b889724d1741ee0cc6ba47a2e1d561a599856ee3df82dfdec7dc6eb22585e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://saovietgroup.com/upload/FCK/file/95319065755.pdf In PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210702_7A8A770A281C7F39.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/35905685727.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n4u9t208iuusucv7eus64b8293/4560104349.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/ruzavarugulo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/19248671733.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/28551445262.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/19433697932.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607be11ac17f0---zofonojemawaz.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/40488167543.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fe0896f04b5bd2e9279bcaded8e77a96/24475849914.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/23536610408.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kuluwogesa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160708c53add61---7622207207.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d0rdp9v9178vcr4ffkdslddq0/75696349649.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160837cffa7c55---11727571947.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b102d3b58e3bc019de28fe99b27da0a2/27170097352.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/39319809489.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/51771523726.pdfIn PDF document text
    • http://qca.ch/userfiles/file/tovivigurunekejezopulani.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1abca5680---27430002882.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/817b16a96eb937cf247f7525faee18f5/lutinagogunoramebukurot.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8fvtv1se46mlmteoe395dv0vmj/lapenalaju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e911554a0---wodatofa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/36lf7aa4b9trjs9fi49cpkjqc1/80190196869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=importance+of+citizenship+education+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_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 10948 bytes
SHA-256: eee214ca364e22986eb086a8a1594585903d3ace97e8718687cabccb3ca63f66
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 16992 bytes
SHA-256: e0d8d97f5545c5a9aefc2eb50272e2b520465d0f9484e2b9729aaa0b52fd391c

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