Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccb95dc8d8374a6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 12:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28ab727fa0f6b89aa1a02999aca14260 SHA-1: a5b4ffa7b475294ecb69f443ec8db3ace5276319 SHA-256: 9ccb95dc8d8374a6a2a437a61dff0821882f7327c95344f105767b0775fd9c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. This suggests the document is designed to lure users to malicious or compromised sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://luatsutiengtrung.com/app/webroot/uploads/files/guzagiwag.pdf In PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bf1d403c70f35b8e91ed9de80ffe2749/delojisulofosajufumikepag.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dc0a8e78d4789ba743d6d2ba4a299f36/najowepogel.pdfIn PDF document text
    • http://oodow.cn/upload/file/210611132619096516ib2yyawhv3iw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1325239e6---wokajetowukifuvewepedun.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101394de2ba5---93076252515.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/74a9984d5d099d26c00a3af38aa813c1/72119203095.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93ee62675---28640114481.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/witimofenorabobumef.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/412ft5ku36h7hgkgu0m51kd7f4/39502082255.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/72346862294.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c42593e1ed5bcf65275cb24ee8e6ee93/52038150024.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fizomigovumukoxuvevova.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/basitarutokasafu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ff9e1f5cbce9c49666f533cfdd05e359/11588034290.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/37584242729.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/sulovupopobasedaza.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/22512739148.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/sewis.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2dfa8f33a5de6009ff789247ebdc401d/dadopan.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/pevokotijon.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/63050573908.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607873cdb8083---nitene.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/49016907644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=digital+electronics+objective+type+questions+and+answers+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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 18208 bytes
SHA-256: 3e3cde18183356c5722a7dd0dc44ae71ff0af4452af507af73344ecbaa18c276
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11580 bytes
SHA-256: 48fd8d8945b9d2bf81f59167164009acdad7847e08375671cf818c10d5bc5d60
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1