Malicious PDF — malware analysis report

Static analysis result for SHA-256 d330afb866bfb130…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 10:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 738f4ffb3637a4d1c6feef09f26e1bf6 SHA-1: 7b8b467ff84a792cff975dab7544d422748dafdf SHA-256: d330afb866bfb1302a099131e45e4bffdac04e2b86ddd476a2e69e7c2d8fd412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=mod+apk+carrom+board PDF link annotation
    • http://spiregene.com/image/files/20210910_044638.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134803c0fbbb---70382149206.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kativez.pdfIn PDF document text
    • https://orrizon.ru/images/file/dubowodedo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902055016.pdfIn PDF document text
    • http://peoplefoster.com/pliki/mopogesulopupov.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rorodexug.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/jurosakefu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gixazeredurenulajo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f4d9bca---jikomibujagurafukala.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duxar.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/24725204667.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/bejajujigokinusutuzife.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267da8b1f1---jazoxowonukiwupodi.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14062659791.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77257662746.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77544809717.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/lurosopifim.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090516258874.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gozejubezexuxubebodod.pdfIn PDF document text
    • 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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17056 bytes
SHA-256: 2490eb5bf1214961c7e761ee4d7564a4ef570730849de3c989267445dcbb12da
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10260 bytes
SHA-256: 52e6df70e8fc2e931e9797d3e304e9e228d9a70e77ebc96680fae2c99df1fbc8
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1