Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cc9d961aaba3be…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 02:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 924f6e53a24c8c505856d8a78c96e091 SHA-1: 17d6bed52b4de930b4e1f04e196984090ced2f7c SHA-256: 90cc9d961aaba3be5f38670d14f57e616ea7d17371cd3944d586ec85c64a1df6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on WordPress installations using the 'super-forms' plugin. These links likely serve as a link farm to direct users to malicious content or phishing pages. The PDF itself appears to be generated by wkhtmltopdf, suggesting it might be a dynamically created document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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://philabc.ru/uplcv?utm_term=what+are+the+kinds+of+quasi+contract PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/85b994c514e19677250d7075e56a6d07/47039872366.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/67090742053.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qrtf7ko70om4a0cvjnblfrq4t8/xivefoguwuxovur.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9pi08kbtln30p072ppp39lu853/fagazi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b059a14c43---44354296677.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/82635699328.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xuzikibu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086714a3b5e5---23954808940.pdfIn PDF document text
    • https://autopratichesas.it/file/fojamuxajilig.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c112641cbcd83dcead26eb0f5597ebe6/38058979385.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/2823395987.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/sinumukabavovutililov.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oj857r593rhbcv2hadjecnb3ms/16918608594.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca7802096---29965448320.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f6adc58075b09dbfecb1e5ee8460ac8/witomi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7261043a1---janavepepalogevidinu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/32779687938.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/45269958935.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/93119801923.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7b9dc9453e534db1aa46e8658b05091c/ganoronuvom.pdfIn PDF document text
    • https://magatek.com/documents/file/77858465125.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/veag9o5bg1k3gukajb5h8koa41/3838505803.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/bomuzofifubutevuzobap.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_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 17752 bytes
SHA-256: 084c0ccccdceffbff0fca5942fe84a7c66bb72bd8f6e7de91f5f86081a6f4cf0
font_01_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 10860 bytes
SHA-256: 951d99c79e8ec69896ce2535bcad7d2f7401b4d885aa3ec185f47da4939b1a12