Malicious PDF — malware analysis report

Static analysis result for SHA-256 f136932be00059ab…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 22:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61ae5ae675b7a8f8f79ecf6fb7a9d985 SHA-1: a38f518a85468da4dcc3cf65490f10a90f5ba914 SHA-256: f136932be00059aba7c89f4ceeaf7431598619c786a374bfc087deaaec392ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate the document's purpose is to act as a link farm. The embedded JavaScript is likely used to facilitate these redirects or potentially exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=scientific+calculator+app+for+android+download PDF link annotation
    • http://superazs.ru/images/news/file/goduni.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/67055214687.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/98292886721.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lonotevupo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f27a7d07f---53699494980.pdfIn PDF document text
    • http://telektrans.hu/editor_up/93436992145.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134065b05f7e---zefasararav.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f2dba234b71969397a42f24862eafe4c/topabemakiz.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/bubavewonuru.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/samabon.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/vezosesuwigesixi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/9391017310.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/rebegojolisoru.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lotomogovavabusafupu.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/rafameno.pdfIn PDF document text
    • https://labelmarket.eu/data/file/jeliliwarudipoja.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed5cb9ecd---54927882006.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/lavolapozosadajofub.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/76930528437.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/xinejosasijajixed.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210922/file/fedunigoluxuzefagadubid.pdfIn PDF document text
    • http://ned.ru/uploads/files/zopigewurunenav.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/11456796668.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_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 17516 bytes
SHA-256: 5e08b0f659c759c0256064ab57bfbeb8343ada42c29c0288a6185386a5954048
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 10704 bytes
SHA-256: d2b904daa39214f4363a2d59e942753b2adc238ba50fa68e30ba85fda0b3950f

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