Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20cd328b263d4e1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 14:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6ea5caa83c66a7b15c1690da730f9d4b SHA-1: 4f2e093eb3b6d9646914aef11e5d64a9c9859260 SHA-256: b20cd328b263d4e138c45e22c714fefd88f045ab268bfbe8e6dfbe6ee49333e6
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://badeluxe.com/userfiles/files/moxegavewitiberoxalome.pdf In PDF document text
    • http://alnoorcity.com/userfiles/file/wironefizilosafedinavin.pdfIn PDF document text
    • http://gotween.com/userfiles/file///51992730347.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c38a122110---newusevuvekatukijefaxatu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/pasowuve.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/26488906146.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/sezubozitowegodevodoronem.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ce5febd76409182bc57485aa1786604/rozuzojabatuz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5a3ec4ef7008cf6e958b94f0068b9b30/wumelafovimozanumo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmfkkuvm9a2inumpq7dbrm29g6/jemelefoxalilodof.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cd89f36b27419110cdf79bfe6cf5b958/78408707641.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1e68d66364877f834060a1b55fecb804/59445815090.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b584f14b5f2---42933867655.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27445561d---lixanozuja.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/wizadowivu.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/gozupatubisodowe.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pukaxesebebupemad.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0cbd850f---62663697976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbfd5b13466---tovomemumotubipelajefu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zepujevutatekapesiva.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/doroberewodi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960bc3952c5---31808222528.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079354c53c24---80122971090.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jejavesa.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/51374036734.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b876c93d542---58650868401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manic+depression+guitar+tab+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10984 bytes
SHA-256: 2713e498a9196681b06db6e4e95b234fa01e9d30af7c85d5acc5a1a0c81221b9
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 16392 bytes
SHA-256: 692c634bed13f1293dc298120406ca018b4fa985cffa7c4b2dac0d9138a2749c
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1