Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5c7e0327dbf574…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 02:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2c180540a636ade4779e137770e89e5 SHA-1: 485430f03e279b13d5abad8051197d39fb9f9642 SHA-256: 8b5c7e0327dbf57478e32ee706f8f705744d02d0f6119e7559cf57017d4a2a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or exploit PDF vulnerabilities to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/flmn15ukemjv7sni7rv6ngop92/fipomajesosuzatalemuvov.pdf In PDF document text
    • http://ivelinabozilova.com/userfiles/file/koxiwupusomekosivevufuto.pdfIn PDF document text
    • https://chptravel.ir/data/file/7562950144.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/nuxoxerusorele.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021081305283094.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/77c1ed4f51f40315aecbe9091995753c/90258993559.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/62520366297.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kupulibena.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/88103520773.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062907382991.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/87766617002.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/titubugula.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muvesovadasasetojusi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53d8e624cb---direzenesu.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/32546836261.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/94dff408fe3eb638cb248e502c0711ec/tovuvadonerarezanis.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/rababumelapabixajekizub.pdfIn PDF document text
    • http://nessium.net/userfiles/file/wuwagawifamavilizal.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16087f78588985---goxaduzedifesud.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kgg96pv3c2jmvu746kipr78e9b/gisuminu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee5ef02a0---jodaxukofewomaw.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/voxekezisosimimabik.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/36305300910.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9631af282---84787545075.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcd1415205de6b180951602833a4cef4/lufizafometinut.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cce4eeb66---kunanikanosukimetak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nielsen+breakthrough+innovation+report+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_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 11152 bytes
SHA-256: 31bf068f504d03c33b331018d00b36bd07003e96539aa86aacc2beaf0a8dc820
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 19260 bytes
SHA-256: 20b4a34c87a627ca740d405b2ecaf6219042eea356dcd4af4ce9a2d560feed3d

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