Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b6a6dc1ba29384…

MALICIOUS

PDF

102.4 KB Created: 2021-09-05 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 652cfb53bbbb1533a449af76cdaad756 SHA-1: ccd30224f1b4b5151aa9c56c85e5dbec91d9d892 SHA-256: b6b6a6dc1ba29384354f83a13764a6447da7f384f4e6672a44e3d6f699da13d9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ilovechardonnayhills.com/userimages/warudamisobumovog.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65207263c---nudaxunojapetege.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b97b0414ee2ceab4c12986d8bb2e116/rexiduverenowel.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/nimamotawux.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/14622746688.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/37991079738.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d656cb472e4---tenidowepinujazoxakatu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/13072067969.pdfIn PDF document text
    • http://jinyezi.cn/upload/rupipel.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/90013277447.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/56902629999.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a628e5a376f---9019684038.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084644bef04d---27135262507.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kd74tbo5ct29usaojreo1rvcti/wifagagasoditujikivomek.pdfIn PDF document text
    • https://istanajp.net/contents/files/tikopakitobabif.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wodinejozugigekafaxati.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/37620770989.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/51850484153.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510050750.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff188055cd---42840105551.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/nazexewaluromesov.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a9b5347beb0a033d6ace18e3ba8050b1/lasugade.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a523fc97cb---fizegepixinazopatez.pdfIn PDF document text
    • http://boldogelet.hu/media/88022026303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kaplan+medical+usmle+medical+ethics+pdf+free+downloadPDF 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_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 19040 bytes
SHA-256: 8d13e8278cac8b992ed3dd1f714bfa9cec56bfc054f2ecdfaadf3b0b0e2299b8
font_02_sfnt_off0001721d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721D 11064 bytes
SHA-256: 1ebe19c526a8203c44284eafec16f59dac1d3b8e9185f234b164116bd469bbde

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