Malicious PDF — malware analysis report

Static analysis result for SHA-256 b177937fd783ac30…

MALICIOUS

PDF

87.0 KB Created: 2021-07-24 11:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c4c3e85170dd7b12fb0e8a4114a20442 SHA-1: ac2f711e42cf5c81cb19d0d95611ac9a2860cd1f SHA-256: b177937fd783ac30d6e6fbf039da1ba89433d35ed86696530d958fecadca9bf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, some pointing to compromised CMS uploads, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://universalgroupautos.com/files/others/81699628670.pdf In PDF document text
    • http://www.kilincsweb.hu/fileok/file/42734485346.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/722f2c7d3eda6ec1f0ff18b50d196edb/jazifefovizegepepuzibi.pdfIn PDF document text
    • https://spacio.hk/attachment/file/37294440242.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9bb614431d6a7ad8435f773fba68a170/97861475311.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/31904088121.pdfIn PDF document text
    • http://someteme.com/archivos/_20210713221731.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/17230511488.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f0972155---69646872245.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/52191236551.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/68862703937.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/jozepejawolinidam.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a63f1e197---tuvijakuzigewesekazo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c343fa8cda7---88384841919.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f215ec56388b62bf77f97dff9c3d7d32/37049782575.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qhlbl6748i5cnqo48ci03nipan/rerorejode.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/25514918699.pdfIn PDF document text
    • http://imi.vc/upload/files/85596980163.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/mugifivamutifobiritibosi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6458cfc648e02bef18b16b05ec06301f/22949030379.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/xazesofuziwuxonajupevaro.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/65586af8b2c299a43a3d507052ea9517/bowemafanevabofeleloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+onn+bluetooth+headsetPDF 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 17880 bytes
SHA-256: d427f47c4df50c2104d03ec010d200f3e53eb43cf50fb234c791e6d1f04f69e1
font_01_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 10592 bytes
SHA-256: 1a5e48632edcc458a204a3faac661bd733e864e7b1edf4886e999890833c6040
font_02_sfnt_off000134ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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