Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da1baabcdf229f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-05 09:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a036b6afc40a49b5d32ebb92004456f SHA-1: 031485a21d39208659af031c10c4a52783bf1004 SHA-256: 75da1baabcdf229f777972862ad6c4b5084d1162cfd75c82a68470b670cabd7b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external resources. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://mispuntossaga.com/campannas/file/77509858118.pdf In PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210608015927.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/231189973.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/nopadiditej.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28468911074.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74390585954.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/72400382229.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d65c7330d---60211685028.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/50361743924.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6li6g4pd29viv83u7eo4223c1/49680033742.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/ruzegujisupiwipomija.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/70332221659.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb59ab5c2---wefas.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/17962250429.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/15307033304.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63666000499.pdfIn PDF document text
    • http://huntland.hu/upload/file/xefutilujesutotadolel.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/23191067f55b5aefc56c553173287b10/15093165179.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/fuposipa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba368a16f4---45242606499.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ltgl38ck5tgaessd72idmm9tm8/55841591984.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc09492abc---botanuvebiwizenadawip.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/70858351097.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/24fc241df38abfcb5a98725889bf2687/dilojepibifozugex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+milk+frother+on+mr+coffee+espresso+machinePDF 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_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 16952 bytes
SHA-256: 450a13e1c876526eccd49801dac033ec44b5041f49577c136711eed7ff1e35a3
font_02_sfnt_off00013a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6A 11016 bytes
SHA-256: 71c33a0da13ba2d22736aab2afcc840f4c53e89ffaea80b4ba6208a0a5b18f96