Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb5bb1dcd3a081…

MALICIOUS

PDF

80.0 KB Created: 2021-07-26 14:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a37413e45b27539a09a67bcee9cb14d6 SHA-1: 10b7cf0f9ff3e3f8106ae3e29690272414a973e5 SHA-256: a9cb5bb1dcd3a081bdaec84d7591f31b950395c115c48ac1a70e92225e1d5238
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6192

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aucoindeshalles.com/menu/file/73229365002.pdf In PDF document text
    • http://computerdoki.hu/user/file/wovunemesuxum.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe62d6957---28231859231.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc207d70e0---2394800966.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944f88f40f7---kokopu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ksqnp88us0j2uvpg0crcdu2ks9/51615185700.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i4i8ihnsojsfqh0d57rfh5qa9r/78417677177.pdfIn PDF document text
    • http://zerosquareonline.com/file/dezexafisisak.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/33613572425.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/sifidufuwipamaxivog.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/dufepi.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/16097253966.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/30503991793.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4ca8ea01b---dudosoxawesi.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/besotigabowakipikilaga.pdfIn PDF document text
    • https://ahha.az/userfiles/file/47631343364.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/saoa7m5lit6ik5vl7bsp6b6vje/padosarafokudifoko.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dp1du6r71lfmtk34u1is3gqjpt/6996646599.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b75dcbcd---sodozuziberawevivevuzanir.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/380c46bf653eba8a10da6b8f640a1343/79893766875.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c1703430276da7e6218ce5bd6167e443/vafozibuvuxufigafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+time+uscis+take+to+send+approval+noticePDF 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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 17088 bytes
SHA-256: d7347be9dfd68c38c85b0a33541731bd15bf444c85b83217b96780d3563dc8b7
font_01_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 11112 bytes
SHA-256: 7d7a532cf460d55ce86dd45e80c5d89477ac3c22ae38e7304c15f13320735f74