Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19858633b63e70…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 11:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5a3280392a020fbbe3afbd2c494ef7f SHA-1: 81622c3e38dfedc27864abd67eb00de7c44a2e08 SHA-256: 7b19858633b63e7009e6138630714c50c90c9e12b111b6a0451576d71ee0678c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://laborke.ru/uplcv?utm_term=how+long+can+you+keep+grilled+chicken+in+fridge
    • http://thanhlapcongtykiengiang.com/upload/ck/files/bosagilut.pdf
    • http://flightshop.jp/images/blog//file/kupawop.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6926c6b7d4---6443384188.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984295518d9---dapivusowejiweviremofano.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b00ac25778d990cbee9a8ad99140fa61/36464354984.pdf
    • https://atesolve.com/ckfinder/userfiles/files/vexowav.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b337181591c---26835930575.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3kejndqgde913mql9cdpo2t261/59078023304.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ed4cc6a3---wiwepefoboxava.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349f85c75b---80725150279.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60b004111---15586186040.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c5cf086c53dde94fd6511c020d531b1d/sokupabokunopodugoni.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5d58q9a4p3j7k4i3tvfpohv09f/tekemajo.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/de00bbe5a6853a1ec69ae84507a5f8f1/sobeganumikiruzokodimiz.pdf
    • http://computergramm.com/userfiles/file/54525661466.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/fn3a1rlftk9rnjm6m4nqp9rpto/suxej.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/8043097489.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e50292cd13---fepoboxururefulixetugeru.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c6616b6b2800d6a94c59f57e5d252a9/vixij.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56dafd6907d238e1f23bfa5146ca5a03/91437212785.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/daa5966290b24c82273037b13182feaf/67018688019.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/i0vtdggbcq9b61rh7kkgh0uc22/pozujamutegonikixovekewiz.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/57303200356.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/42ad1d7d15ccd402b50cd7e35895c541/jureninazosivozoz.pdf
    • http://myconnect-thailand.com/image/upload/File/vujetinemowirewos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
font_01_sfnt_off0001087a.bin
a23ce30e640a5748db4a990d7979552e57f5edbd2b8d525284a27a52de409e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 11016 bytes
font_02_sfnt_off000121d2.bin
2208055ec403da5fe97eb81f93f38440aefaf2447e48055a34a253c7ebde886d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 17228 bytes