Malicious PDF — malware analysis report

Static analysis result for SHA-256 280e73bdb2c2f5d4…

MALICIOUS

PDF

89.8 KB Created: 2021-07-27 04:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ef551393091b8408cfd752d01862aae SHA-1: a6c865bb4bc2ed942d22229d3bbb4ea04a81ed4b SHA-256: 280e73bdb2c2f5d4f093e5e1df41565d94b51352d4576c87dd3719aef9a6ccde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://livingkaneohe.com/userimages/70337604687.pdf
    • http://poultech.net/d/files/jeluzajisudowolasaxatokid.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5e3f9288bd27554871c6244a7a8bf851/donawirexojogarogajugupev.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b214487d740---sekejizabixef.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/00419b8f65aeb241db774ebb1a22428e/nopebumuwemetedobixalug.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293f18ae7b---nabojerokegubad.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/355a25e59677de666317f818eb42d2e1/kujutedukikepe.pdf
    • http://lycee-elm.org/userfiles/file/vexivosulipuwikasenozefi.pdf
    • http://elijasprojekts.lv/files/file/dosiwagewuvimosebe.pdf
    • http://hytechplus.com/userfiles/file/dededaxapupar.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/23797383569.pdf
    • https://aviseco.ro/userfiles/file/jababivosinosifokelatirol.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17517448339.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c901429447---89216218769.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a16cc2b7c3318dec086d75ce60fb9db9/tesevovugexefimune.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/jevidilapoxaninelina.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cd84c627571489200ca5515290535afa/23279816301.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd17204b86---43922757255.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d58ah6pnfpl812fvbtkkgouj0/geniziremadejokekafu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e16dc1a28---logesiboropitefavuxud.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7cf31c4b---datidepidibadevejewijegus.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/637793e8dbd2e671fb8e9e4468b68f34/14244358608.pdf
    • http://kag.fr/userfiles/file/medexubivazilaku.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e0c940c2a---fupijarozuribosumasenozur.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926fc818e49---62443850400.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cuantas+filas+tiene+una+hoja+de+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ad.bin
d67005a076fc5b77308417643930c03987717f7bfedf95625a3fc53666901e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 18688 bytes
font_01_sfnt_off0001262c.bin
e253af22aded650b864d59fcb3a653b498e0df6befe01bb609619707d5e5ddc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10836 bytes
font_02_sfnt_off00013f26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 16792 bytes

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