Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ca6095f80f296a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 00:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21882ac58eab5d4bf3f186bd74c91164 SHA-1: df5ab10f11775aae44693bed84c85a922c018fa0 SHA-256: e0ca6095f80f296a417a6dbd710779295ac1ed275150c0b45d1aa650690ff609
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the document features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://kpdb.org/userfiles/files/43741066735.pdf In PDF document text
    • https://whereestar.com/marinarubicon/admin/file/zadosere.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/roloveviperelelibasadi.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/sirinawulewekebeziwule.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8d9e79c7---68716711044.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/88515725055.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/26526578095.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd43872022---69166034830.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/goloxejilidadinipe.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210911052940872.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/97559477796.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sijapanose.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9a2f094394356ada17b8871b93dc93b8/kenopobawiwuj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9c8c67086937809283eade11b68ef8/22017420535.pdfIn PDF document text
    • http://sparkpro.lv/content/file/31933019911.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/lakipovusujipefi.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/xebozet.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/70240286881.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/71362792643.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6f85f998---tatajebuniz.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6bl6ea53idm6nvfk198muga7pf/79628856670.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/gazujidopedof.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pumalebakezaxegijamarik.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/70591359989.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/55109300359.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/lozilusovovus.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zapozudifolamokevilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vidmate+2018+app+download+mp3PDF 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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 15836 bytes
SHA-256: 7a9542374662592ea3de0dac249e633a3a505bb71d25a0a59312338a738d3071
font_01_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 11012 bytes
SHA-256: f907c724a3d2786f43100be4c1c1688f4de2c11d3e9a460986bf31aebd0bb62f

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