Malicious PDF — malware analysis report

Static analysis result for SHA-256 b494954b3ee8b15a…

MALICIOUS

PDF

76.9 KB Created: 2021-06-29 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b664130c05e8bcfd52be4befac4ba08f SHA-1: f18420aa2c7f49ed4a8ff7db83376b6833a9a9f0 SHA-256: b494954b3ee8b15a176064948e239d8f6e2dbef469857f775b9032a684a118ca
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV, indicating it is a Pdf.Phishing.Trojan. The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://crysiq.ru/uplcv?utm_term=how+to+checkout+a+new+branch+in+git PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c223f14cd67---toromozuzi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c5cf6350d8d046f808c16c084f22e3d6/rewewujazawitos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0153ceced---55532787966.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/tukukimawotajalogujerenis.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45546725f3---gopofisolulukujot.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/18518449797.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/46795713627.pdfIn PDF document text
    • http://webursitet.org/Files/file/loduzoworazevar.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160944867f3136---gepite.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/11660607343.pdfIn PDF document text
    • https://immobilgold.com/file/72681506090.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/piwupubatadisumuwuzezuguw.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c25146d088bacc42c47600dba4b1e59c/72444077058.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24cbefed3---36409298442.pdfIn PDF document text
    • http://armanetti.com/images/26903919813.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a354a3630---36801527072.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/rabokopuxesu.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/81375974984.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/62482157741.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/87450904908ed2c126be986164cac927/55273405903.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/fenabeteki.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wimatiguvimawagufekawise.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/23384112050.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d23138b4e5b---3103002435.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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 17128 bytes
SHA-256: 40b6b23812d7d7913c9e8eacef7507e5454c5e534c51b50c234d981706f4762f

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