Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a9d933cf52d287…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 08:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e28878c991d5b55df29b6ef16fc10ca4 SHA-1: 529a1415168111a1115184e778705bd1ecb25354 SHA-256: 18a9d933cf52d28743988e1076d154752499b7101784329b8aef57bd72ee26d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=android+mobile+clear+cache PDF link annotation
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31455360873.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ca431f26---37684362385.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/48703366017.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/30227764012.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/runikifovaroxafat.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/zudorigowin.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/84566400458.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/ritakobiwuvojepif.pdfIn PDF document text
    • http://szjg.hu/images/file/41569244380.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22502930389.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/45020637947.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/nidutitutuwivotafi.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/votevodaluwefupib.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/21722224188.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/86173505549.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5ae89f14---julagusorekaza.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/98107664163.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa07de32c2---vuxajepukaxidodege.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/6861600314.pdfIn PDF document text
    • http://baove24h.info/upload/files/79022434698.pdfIn PDF document text
    • http://slovoveri.org/userfiles/xuvenesu.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/palewonupufumatigelu.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/127831419613cc4d9a2911.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/37170885203.pdfIn PDF document text
    • 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 17640 bytes
SHA-256: 2d0263871ccce69a3011044773722d2ddd9ae707086eb5dd5f2f46a42d107889
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 10488 bytes
SHA-256: 6369a6d0ca154483f43184a90d940d05e35d061c769170caba54c325b61700ca
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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