Malicious PDF — malware analysis report

Static analysis result for SHA-256 3427c2d97a58f70c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc892e99db005c400a220d48dcb27ae1 SHA-1: 6e15e37ba294cea6d101d8794bd961924083a096 SHA-256: 3427c2d97a58f70c84127e1d3044088d2c145183a874b3733faf9019f61c5968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ijmscr.com/ckfinder/userfiles/files/solab.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zogenozote.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e8f07ac28128c4705974e4f902968bde/54571573832.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/52817049849.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9266f298707eca3fbebb32f0bb1add61/50873442184.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/polobemowixamidugevabajor.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b713734c6---rewasolofisamuxusid.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/27157439272.pdfIn PDF document text
    • https://norservis.info/files/files/93476237937.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/fomakudosagarozosuxoxog.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/6f58e05f243ab565469a6727e12a42f1/gibibozawi.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/wenabidiwaridububujiv.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/24495925564.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7c127243cf88d0400bd989b512c79833/2137709564.pdfIn PDF document text
    • http://proxima-design.cz/files/file/ribanezopoxizi.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/35749091040.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919f4d17bc2---jomaduwokowu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rilaxodoso.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2a18158e6edbb5fc0bd1a6a683d81e55/rodaxanelufexopat.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ui3h84v7qo53p2d5i7h4he0ll4/53106820904.pdfIn PDF document text
    • http://marketingnews.fr/images/file/pubabazoxomobuzafik.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acdace4d46b---jusepubewal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=converter+trabalho+em+pdf+para+wordPDF 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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 10828 bytes
SHA-256: 0e87954c33786890cbb45bb84d0d957ce1d7f9c14eeed9bf765797d0daa45c3a
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 18996 bytes
SHA-256: 4d985a682662d615611f23b1407710e892c8869d8bcb31b6b4fac7803cb93d82
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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