Malicious PDF — malware analysis report

Static analysis result for SHA-256 94063451abc84f91…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7812d039c8d217e1637a323dc5a08746 SHA-1: 692ea819b287ac95d20edd1cb421c112b426ba4e SHA-256: 94063451abc84f9100006bc28cdf871a8ffeff3c4166ae7086e1acd57b0fdfe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDFs hosted on compromised or disposable domains. This behavior is indicative of a link farm designed to distribute malware or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mehreganimaging.com/images/upload/files/65187332187.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/sapijevoliwule.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kujaxesuxupuxapolap.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rigebukew.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/odnlql9apdqgpjagqgefkqf9vgs6tlhr/susezisasebokamevepodoba.pdfIn PDF document text
    • https://istanajp2.com/contents/files/90258299411.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/74599161433.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/43804186182.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/gagupeselifeguvilow.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/90250120407.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/novaxuguf.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161411c93eb45f---beramuzadujetobe.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/82044320976.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/81758053413.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/modibe.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/livuxukarijurobugor.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/61003300364.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/47059323391.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f3fd923f---58199932949.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/kijew.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/polemexejigizag.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/bisapijateg.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/61429352551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=months+mind+prayer+of+the+faithfulPDF 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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10968 bytes
SHA-256: ed9c4678f32e89495d0d1ef70ef6034e3f23364d2ef9254f43b8a6ab56c66dc6
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16968 bytes
SHA-256: 3e6a1bf53d29f8eb232bd01a513ccdd6ad8a31a9da71a00bc97e3a239224400d