Malicious PDF — malware analysis report

Static analysis result for SHA-256 41978b018a6e5602…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 08:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d5c5689092946604b61f44ffffef755 SHA-1: 735f371c931df2c90b6386902f66f55ea0c66254 SHA-256: 41978b018a6e5602fb74f95ca252c282913ed710bb940c2b823137ce1025fe86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=kagerou+project+characters PDF link annotation
    • http://enjoy.sk/editor_uploads/system/files/lijeb.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/18946891856.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f7ed3de2---lilomixivupuvesakupe.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/rugemawawibisoseze.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f589b226cec---zitapigopenoromikara.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/22c88e4ef46ab75b56c87320f266c0ad/sobosaxides.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/kogepojijexevoworitu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o7lj9q68nok08dhrjtiqnvats9/xonipanubonadaget.pdfIn PDF document text
    • https://actor-conseil.com/files/file/57224873011.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/964e114b77fa0abe1e4ea15cf25a751a/20407396469.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pizegisof.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/rutepolazutitabisor.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803188b4f98---mesuxafeduvaxunavalib.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7ba39e18---sibixobozoruwev.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/sized.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6475991492---97476905830.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ck15l4jargq546s7s9ett75bf2/4388049141.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/20501271592.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/45879099323.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/wesovebane.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf8ca4e7b2---doxevi.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/60782544945.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rv8ctrqpotduch2lj61h3j6ca7/29574131051.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15178869622.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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 18224 bytes
SHA-256: 786f07ceca99ac70777b20a7d7dcf5c8f4560dda23660db4b810dd957f78d7b8
font_02_sfnt_off00014670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14670 10632 bytes
SHA-256: 9998b4cc227b41d7f281aff9c0502efb07ad6fb6478ea80d467257318ff9c39f

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