Malicious PDF — malware analysis report

Static analysis result for SHA-256 58634c82695c174e…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 14:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2efc49b3a8142b7a242dcdf2d57b168c SHA-1: 33f0ecddc9ca7bb081f939d43c2fb7ef64921e1a SHA-256: 58634c82695c174ec2e9529805f9d1083b46ff1c66ee944d041ccdf4ca534f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ingore.cn/upload/files/gamarafopix.pdf In PDF document text
    • https://makenie.com/upload/files/14897124886.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fadinoxaja.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/pusegav.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/89vcmlo2up94sa44n6cem2lriu/vuxarizof.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/faperiruvez.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/nolakumirojexajemiwilopup.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/xibelotafowige.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_26_50_7817.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/4289499605.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rikolujimaxowinexeger.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/wuraboxak.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/lalitidadefeside.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/zufirowitajapumaz.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca76567f5---kabozonoxijixazivutijupon.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/rekigakaximumul.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/jokixukufituvopolodiziw.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/sitipake.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d477ad5ebe911c7b38de4656018062b5/nokaxidodoxava.pdfIn PDF document text
    • http://fruitvita.com/files/files/54877916949.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/10038276009.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/bejonobametivodanu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14256895476.pdfIn PDF document text
    • https://patc.fr/imagesfile/fuwetolazabemofitotigudud.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/19083529828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=titan+board+game+androidPDF 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_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 18340 bytes
SHA-256: dd0b25915472533f8d31fc481f1f060e15bc434312e74ecac723d9dcd9a968f8
font_01_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10480 bytes
SHA-256: 60647facb9774efcc6b9eb98f345951b969e4b701903eecb059af4a6012642cf
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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