Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2ffba2382da42f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 15:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 177cb8e2d8131f6f325d9334826d7e1e SHA-1: df56131ecc2382c27fd0d01a19a7aa2c405925fe SHA-256: dc2ffba2382da42f44b6cf82dd861e6ef3472a8c964d851531d83b0add17844c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://svetplus.com/userfiles/files/52589689207.pdf In PDF document text
    • http://hamkr.com/userData/board/file/28245730232.pdfIn PDF document text
    • http://viorina-deko.com/images/file/16406110232.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/31754244090.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fuau6gihfkgd23dlg8a9cvgsvg/24570136006.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/32066543870.pdfIn PDF document text
    • http://rnralpha.cz/res/file/46241625957.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f01583770---lujozoxinudumojamawovi.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/rasavodagijajosixaruzozad.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ba7730a34f97b406b3a362554bf913fb/8296968018.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/44226934724.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/pojogukojusoroxenesujux.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/zebufesoribele.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/nefokilurarunajasaxajonog.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kotonesogepepusa.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/15895897460.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tobiboxiraju.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/81555559631.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/koxixurujar.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/zekelobudifobevexeg.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ffca0006440a583f53bddf2f5f23bd38/52989787828.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xaxolemezidadeketukulis.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/dipusa.pdfIn PDF document text
    • https://wineart.online/userfiles/file/15060945297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=remove+protection+from+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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 18108 bytes
SHA-256: c884adc0bc1d439b0370dea92b0f24af27c91b6bee6622aa133ea91312e7a6dd
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 10516 bytes
SHA-256: 0f2a6cbfbf99b3f5357653e22582c8a9d2412a54158635d67dffe9693133a142
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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