Malicious PDF — malware analysis report

Static analysis result for SHA-256 6621543d1a163722…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 15:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ed40c4396170717119619d2d1822fb8 SHA-1: ca7a10780d9006b50b3b7149b07a64e51e42ed0a SHA-256: 6621543d1a16372290db49f44f7af5ef7001403d37e261cf550ce1d2d5b06a7a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7432

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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=zombie+rpg+android PDF link annotation
    • https://bankkartya.hu/js/ckfinder/userfiles/files/39084000490.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/90311309455.pdfIn PDF document text
    • http://vodnik48.ru/content/file/8967154206.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/44839504356.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134092386fd0---vokuteki.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/xetobonalivi.pdfIn PDF document text
    • https://curvy.tw/upload/files/43159179039.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/dojesebi.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/texibumuvewupajabevom.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312229266648.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9733181883.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61bd23a5c---rolexazuridemiwunur.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/34215130005.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/31309949359.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b17680ebb4f056cd3fbbaff930e9ea6/21313057735.pdfIn PDF document text
    • http://195exim.com/datas/files/68336741380.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e50e8fb9e---wuxexogojenuw.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/soxivevat.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/vuwopamuwedirem.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62255353135.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sotedisiwug.pdfIn PDF document text
    • http://cutskytools.com/d/files/timapuxovapabile.pdfIn PDF document text
    • http://turatabor.hu/media/84764246755.pdfIn PDF document text
    • http://orderkai.com/uploads/files/loseniga.pdfIn PDF document text
    • 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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10528 bytes
SHA-256: 88e99aef4064fd7cd5a622242e9096a8295cbf83eddda84cf1d0fcaf5958bf02
font_01_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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