Malicious PDF — malware analysis report

Static analysis result for SHA-256 92400f7ea39be61b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 01:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa34beef4057a51d959fdfddac30f750 SHA-1: 912df946fcd8030527fb1f3eaa8a7248d6e8944c SHA-256: 92400f7ea39be61ba4db3ff0af8543c1367faa7719c38e51993a7da675acf73b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seattledesis.com/fckeditor/file/vulasoz.pdf In PDF document text
    • http://lidaoxc.com/upload/files/wejanidineronezawajiranu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/21132916784.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/73091187049.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/45055143042.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8eec917037fd60b610d87ce514e786f0/zofatokaxojiwes.pdfIn PDF document text
    • http://tcihk.com/userfiles/xikomive.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/46026115513.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df467493---taluwi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/40612067647.pdfIn PDF document text
    • https://arerp.kr/data/file///jozovodesav.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/38318778936.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/gofunuzaveforofuxazenor.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/sirinodizanip.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/97861951637.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d187f202ad.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c59912dbc---68704095443.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/nulazasurupawot.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7ee82b68848654c6f08cbd6808adfe0c/sapazalajologuravax.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/72115053802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=contoh+undangan+pernikahan+kristen+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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10956 bytes
SHA-256: 1df9923d06da4f4d96fce0914d434520cee353cddacf1765be02f21fb5f9c52f
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 17100 bytes
SHA-256: 0f6b20a0ecd9d860925ac923ae8287e8acafb10898eef3e1a0ca3ec90e6cd2f1