Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e1f54798e7d0cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 14:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caa629658a07e5d4a28bd7f4cfea92e6 SHA-1: 829b16ddf39aa8a275363ce45a5ecc1380a1d80a SHA-256: e9e1f54798e7d0cb4a9d664b79d140340fe6bbd923f219eb9e222e1084b2e36a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of embedded JavaScript further suggests the potential for malicious actions, such as exploiting vulnerabilities or redirecting users to phishing sites. The primary attack pattern observed is the use of a link farm within a PDF to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=sertifikasi+cdob+pdf PDF link annotation
    • https://clubberia.com/js/ckfinder/userfiles/files/winopudinupamumafevil.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1623863742.pdfIn PDF document text
    • http://juncheng.tw/upload/files/9210699093.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/57228365335.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i85ft3h1qcnnt5hl2i5uknthf1/kitadumaruwejud.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kusipudabubevuviw.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/22817828986.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zitelixonaletomot.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/99978835961.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/35469805564.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/22637024215.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/10013026692.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/88842369180.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/32112626652.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/redoxarakepara.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/28719049176.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e2p0fvsmucbgtd2av8a8or4cf2/namulozaroge.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa03692ab---93766446319.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/40273404215.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rizaxedalogeposeginom.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/zowuvamefimazowexesufusis.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5ai253focmhf69ruldtdruchha/fanisajipakikututisamawot.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 17328 bytes
SHA-256: c5a85ba0adc8ddcc39071f0ef8078cf259916e6d191be77f25390eda92fb7708
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10772 bytes
SHA-256: f2d83f31547828191033779d7621f3e1093201e391ef50d74db386697c8ac6c6
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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