Malicious PDF — malware analysis report

Static analysis result for SHA-256 49699a42133e663c…

MALICIOUS

PDF

70.3 KB Created: 2021-07-17 19:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5235f753bb831825c8cd2b85e202da87 SHA-1: 7fff6265e6afe7266c094ec31af79507853b0bf4 SHA-256: 49699a42133e663c489437141ac152a595b85f79939c8eb911475de990de7926
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple distinct hosts and URLs pointing to PDF files. These links are likely designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7666

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee717e569---77456260523.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54b344de0---digemo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd610cc1e---pevimugewugatitedorajowi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9b417542979e93cac19e067509d1e0ac/dokejifevitozubatozelaz.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/45241606724.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0356ae88---3541606775.pdfIn PDF document text
    • https://kenadong.com/contents//files/xakabaxusur.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/013c7c126d019b8bc061e330988d7c19/jogitasim.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/39309805481.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61628c141e---pipomemigoxu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/29442285259.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051805234173499.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/virarifigaz.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/li5nhdgvv85nmpoo13s944kmbc/tujetugaladurugijimaket.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f00d2849---rusis.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84cfb9634---44222487742.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dcb9e82865a966c40518defae8ed554f/wanagiton.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/jixuro.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160774d0ed5e3b---85905817561.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096940c3412a---wifosuko.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/zowazevimemilunaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bloodshot+2020+reviewPDF 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
stream_003_off000115a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115A1 920 bytes
SHA-256: 38e19968e84f9387c449992d962c3575effac6a21fda39eebfcf540d2af8c5be
font_00_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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