Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ddbf0e967a46e4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 08:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38dd1bc3fb274464957a158eb2a53051 SHA-1: b0ab25f9b9aa2dbcebc80d7767622e42c97f536b SHA-256: 88ddbf0e967a46e4798ee1f04ee3c146b1c54697ac081e55ee2d5c8b42948706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=wr3d+wwe+2k18+mod+download+apk+free+download PDF link annotation
    • http://bookblog.kr/data/file/files/86803311156.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nopekekijatufebuzomipusol.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161307a7ec48c4---kuzarenulexufixexifana.pdfIn PDF document text
    • https://quizai.com/uploads/files/98452406220.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/99602361686.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/54806910247.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98141390837.pdfIn PDF document text
    • https://timminsrenovations.ca/file/g2XFc1KRPVOyZHGO.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d1d97ea8---47527169991.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b21a1f709b0428806a8ba598b3d0cde3/90457424982.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/59577172038.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613932dda8b1f---mowesa.pdfIn PDF document text
    • http://chamdure.com/DATA/files/98036681956.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/24788546036.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/65253292007.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/63554401035.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/54213377581.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/57485085297.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/gibokosafutukinerabe.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wizuleralidafado.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vamesasefajesixago.pdfIn PDF document text
    • https://susta.vn/userfiles/file/47683967795.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_off0000c075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC075 18684 bytes
SHA-256: 5f9f323cec48f6693c9714eaec5dac1c83a4a73057a7c4f54e52540c64b4cc74
font_01_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 11024 bytes
SHA-256: 9b850e9781fcd57c9024bf42c80a409517b489c1a98b91c7af2566259e43748f