Malicious PDF — malware analysis report

Static analysis result for SHA-256 143a75c121e7c3aa…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 00:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 27a49248840b42b06c105801a3798e2b SHA-1: 721715e005ef912ef7d9e248fe9d9715e1571e1a SHA-256: 143a75c121e7c3aabee4cf508db83e10479b813e5a39e668fb3e2f8ba8ee772d
154 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many pointing to compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7679

Heuristics 5

  • 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
  • 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://huaku3c.tw/uploads/files/202109041147201621.pdf In PDF document text
    • http://mtcnx.com/upload/fckimagesfile/pokufotosowilejeti.pdfIn PDF document text
    • https://actor-conseil.com/files/file/kovesipakuji.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/37275000115.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339753ccc0a---78692945663.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/55183213817.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sa3tcgl67e683ntprc8rj33iss/27143253309.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/63359935753.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wizozezamama.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38243922028.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/nubojor.pdfIn PDF document text
    • https://onlinendttraining.net/files/tafujidiniben.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/65914771135.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/winexalixipotineruzeger.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/74842111898.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/80392950743.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceae88404a---47713976166.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/61401547416.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/tawuvopobowapujuku.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419078511b1---rasosuvoxadosetawekejerup.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/nilapetemaxebezo.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/17824931733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+can+i+secretly+take+screenshots+on+snapchatPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 17576 bytes
SHA-256: 018eb3b80fccc28ab1efeb84d0c2825abc79ae2b1d4ee114480969c976832534
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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