Malicious PDF — malware analysis report

Static analysis result for SHA-256 6423ff3340b0755b…

MALICIOUS

PDF

98.9 KB Created: 2021-09-02 22:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6041dfe86e1436bc2d219f97165e0830 SHA-1: 72257142c6c9d7d3282619a50e2f4ba36fe182d0 SHA-256: 6423ff3340b0755b9e4bc68071d8b72c2b963b5a8f4d02ff8e11947be53a9d7b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. This pattern suggests an attempt to lure users into downloading further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

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://10glazsikeyrosa.ru/file/favedimowawinez.pdf In PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tajorinoralixapowu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/pirepag.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0bab5b8---8062366368.pdfIn PDF document text
    • http://philboyd.com/55127506261.pdfIn PDF document text
    • http://ahchala.com/img/file/xokakoxuturokobazetegewem.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/36084441289.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611279bd1abfd---wudapeselovepi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a0cb9383---11978226297.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc950346d8---jopedapasuxilimaj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0n7vrbc4tunnh43v3tm7g7v5c0/bamufujaguvaliwet.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gabupelujazol.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccfc27e17---16256396853.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxenixigegavexosaxedan.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/joredarono.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cc1dcac83cd354a5b90c4a2254c247cd/puvizodozipinubanokuza.pdfIn PDF document text
    • http://candientushinko.com/images/file/lataru.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26741075e2---zopimeleguduvaxibajimepif.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/bofakirib.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ee19a564---48497992842.pdfIn PDF document text
    • https://parfumzone.ro/files/file/4022849085.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/98761908494.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/lugubimazofiz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/nopesobodipikelaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=alessandro+rezzani+big+data+pdfPDF 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_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10856 bytes
SHA-256: 92974506bdd3ade3f64cc5506f1d5387e854d33b9d593814f78ed6ea3de06485
font_01_sfnt_off000154a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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