Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43608bfc09e1d0c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 21:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 805b4d32ab36ca2897b1db153bd59128 SHA-1: 20192ca5ff978b8b5a60f5b9611f0171ad092c15 SHA-256: a43608bfc09e1d0c4a2b6d4b342211f20b6df386326edd7eb4e1dec075bcff1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lofovigobigamodovun.pdf In PDF document text
    • http://muntepa.com/userfiles/files/42285882527.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073929c891a4---98512431030.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad8ad63c8---podaw.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/45177724977.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/79522545761.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e19e6471d954897b0b6b27dbc645bd5c/29184978885.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c70f67bbaa---27207210433.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/62704688754.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/25113131074.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f6474965bbc7ed89b2468ad4e6fbf226/7003772735.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/47142675730.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210801004325_1hwsxd.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fdf1ae88c---57808924671.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb9e1719b---nasurolaruzitimaxifarese.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/91057018125.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/39700056848.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/79188226773.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/kepigebibezegawidasupoj.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108241650115911.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9a6b731af3061b15e02bf7e68b904e89/29362985618.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/92933765835.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd57232ad---85318182300.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/42793309256.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/89547049069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chaos+charles+manson+book+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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 19380 bytes
SHA-256: 5b647507d6f9d4ea1f7a00bfeedb7668d7cec27bee0796d49313349050890422
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10960 bytes
SHA-256: cd455423fd4e9631fade3bb7b2cdad97f48d5b8aa28b05ee8f38518e5434b9ed

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