Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaed4e9ec7b972b…

MALICIOUS

PDF

110.3 KB Created: 2021-08-07 11:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73dddbe5726d5ca997121fbfcada88ab SHA-1: 25782d1740ffe213503fd3ac3336b69113c25b61 SHA-256: aeaed4e9ec7b972b600bb7418ea38f9b797934ed4489ca1719e8277c7a51f96a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=soundarya+lahari+lyrics+in+kannada+pdf+download
    • https://fablab808.com/nbloom/fckuploads/file/32656168794.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b9beac1bd5e6fb4ba587de90a52e48ea/72129004310.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/fefulopixabipuv.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/v79la4qc420jo4i7km02ojkkk4/taxabezuzofigibukuxivo.pdf
    • http://accessiblevehicleservices.com/userfiles/file/kijikugezeki.pdf
    • http://biemmecommerciale.eu/userfiles/files/32203890713.pdf
    • http://arabic.cz/ckfinder/userfiles/files/mesobiwozikojasi.pdf
    • https://towa-aaa.jp/userfiles/file/vafapet.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/30gnpmq8iaef5kr53beirtr79i/joxotamikuw.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2595ae796f---gijazobomomimubaruj.pdf
    • http://toyteepee.com/uploadfiles/file/210609062548770856rcg4z2.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kk4l7vmuq4pffqle9fgr41q2f6/64837149145.pdf
    • http://booklandbooks.com/userfiles/file/derefuwujibow.pdf
    • http://touchpanelpro.com/upload/files/liwizabinafeforetimim.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9c3c299ea---ruxikapu.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/a9uuu9j5m5ue1r9ttcgk52ve75/19178127784.pdf
    • http://topcudental.com/img/userfiles/files/bezamoxoligodituxanozuwok.pdf
    • https://torbay.ru/images/uploads/file/79433431900.pdf
    • http://renovator.cz/files/file/21463369834.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2287f82f---befanimavizafos.pdf
    • http://kleiberit.ru/files/file/kifubesuvanipemuriguvipi.pdf
    • http://seabeachthailand.com/UserFiles/file/17694062492.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifanijipuxomazelelaw.pdf
    • https://bliznacite.com/files/vovivurigama.pdf
    • 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_off00014d50.bin
60b162b944f37c035ff4b5ea8d0e3fa693ae3e9f09a9f3e7ed7c759fada0dd74
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D50 17056 bytes
font_01_sfnt_off0001791b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1791B 16792 bytes
font_02_sfnt_off00019132.bin
625b8d0876f2af0aae90161e0344c2fea81f71dde4b0981f1f5c39614324fb41
pdf-font-stream PDF embedded font (sfnt) at offset 0x19132 10952 bytes