Malicious PDF — malware analysis report

Static analysis result for SHA-256 92beaa77630e7d73…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 02:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0ebe83ff985dc202bd7c676c0c085b4 SHA-1: bf96603f8eb97dba34f312aa91434f3f8a511737 SHA-256: 92beaa77630e7d739654c83a885d23e801e9ae411b494bd21a1ad829a3e58f12
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=homefront+film+streaming+vf PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c983ef22c---sibupulilixa.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/46259885425.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/23741091825.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/80043371583.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/budavapulapusenosofoli.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/87314861700.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/10627170465.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gorotova.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86cbef3d0---pukija.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s1bp4g0c1qjvp0amiqg2pco9pi/88130946558.pdfIn PDF document text
    • https://trieurodata.ro/images/file/89141549831.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/65184336133.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/sejabib.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/69617611999.pdfIn PDF document text
    • https://masihpt1.com/contents/files/20288552895.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/vilup.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/damejejanojupuluzegif.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/nofakonusena.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/xivupax.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/51564811984.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/zubepabeg.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/guvalamuxevavipenabo.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jaxeratesokukisomagofaro.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/pekifol.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_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 20212 bytes
SHA-256: 69801671061efcdbb02239e78e7573a294a1cea841fadc48449afede12be6874
font_01_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13079 10616 bytes
SHA-256: 076199d504e06e9f047da226a166e1d3da395a7cc1679fd09af8c94eb1f58c62