Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e82ee8bcb7d64d…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ad0a8019b519272fb3cf200806eb1ed SHA-1: 9bfc6483853735ee052097dbfe6ac991f7d8a543 SHA-256: f3e82ee8bcb7d64dacc3ac956e60df53c9d195a1a66261059f4c1d0c8fe05ee9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to numerous external URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=computer+systems+a+programmer%27s+perspective+solutions+manual+pdf PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/f225fa3885ed29b6a4ca7bf9a0e0e7fb/90590876973.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c37bf38f5---77883351348.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/roropemomavajexosexisubo.pdfIn PDF document text
    • https://businesslife.com/content/file/43093592404.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/94869886893.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9ehu9p4s5c3263ndel61fj6616/tulinobebos.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cee5addf---wesomafapejejuw.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/80354878105.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9a2121d4---43636209739.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a8be9a897dc2c6cec1f3bd3bf8a88460/dukuxozototi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74921bc1f33124c3c03dbd8b2721a570/jawomoxuvubisozoma.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/pidinizuli.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/57116355489.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f705e47014ff97d7c4ff0f45ce778795/bozakofakegolopamunegalez.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0b88275e03c006d78e7c0adca037e604/topuf.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da95dee4b---38424562758.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a7fd698d2f76818cc5f8dd79cabacf92/wamujezimelagatosope.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9419c7493e---xepesadodagoxawogudeloda.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/43050894097.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ccsgrhqq7hdirrdecha1gog315/wiwamugifu.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/43924155397.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161107e3b6123b---56938972464.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/97471786631.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00921a35a---30421513438.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/26994025295.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_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 11308 bytes
SHA-256: 4308845f1945ef699f59cec254fd4eb853e83b840a2ed0c53ec7013d00c00e42
font_02_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 21640 bytes
SHA-256: 058d1934a185eac1cc033594f533fa561ac4b42340c69579d9dff3e70c884255