Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f881eee12a150fe…

MALICIOUS

PDF

82.7 KB Created: 2021-08-01 23:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6de10330eba87991ad9863224d98aebf SHA-1: 96f4eeddb5b0d65c5a3cc11754d597d67361d456 SHA-256: 9f881eee12a150fe15ed974019d20da5e11551b193ae27be58c686cb52ece1da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nhd03spbeg82p1dulo58ndu143/letedeg.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/60330585402.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/74564898978.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/81396065165.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ea8b0ff0b8ae65d6e12224548e99358d/refusafowenimigadeto.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vorowakapi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gipekonab.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160991d0dddf54---xozitedesisose.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/896nmb89iaaol143sjiiog5711/dejunuvidugexitedire.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d796edaa4---88931362502.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/wojilovek.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/mukumosujuvep.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607916c029b51---gagedibafuvufaxikebuful.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210721_6F673CE5D3372AEC.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/guwixanufirojeworu.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/ruwepawadufereru.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/2373987329.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5546778c6d---vemifozotatuferef.pdfIn PDF document text
    • https://capecoralliving.com/media/file/22161310157.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7ltgko1i9ndm54h4jnecpg2ffv/1915416429.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/xixazowezen.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/db41de019ece1b36f6eb19062a9fe498/dutomevakuxito.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f43f6a51e---77624424268.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/10960623807.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/80404712404.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rehnno3gm06lukfbladnfaerv3/13326684836.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210623083213_cmeaxv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cheat+burrito+bison+mod+apk+free+shoppingPDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 16312 bytes
SHA-256: fcd837df9803b3cb56c41ab9422c02f76e13567f182e0dee7f04d632d3dd2e7e
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 11264 bytes
SHA-256: 08c9b827c939827c31a23bb6d6d2f65a946b29797c9801c156e97f67744dd8f2

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