Malicious PDF — malware analysis report

Static analysis result for SHA-256 129ecbb3c4d76ea7…

MALICIOUS

PDF

79.6 KB Created: 2021-06-26 23:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8789fac54c247d32d76cadee6b652577 SHA-1: 3e71b7eb0d025757327eb5b36344652195fbfa54 SHA-256: 129ecbb3c4d76ea790b0bbdd365fb31f3a79c36931f10008859159414b9296bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073050b5363b---70380914148.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/20543741623.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4cc0d0a1385c38d7eab3e52c02e3d62b/74201864246.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/vekogeluvafebojuf.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c85aa280---11833592994.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dba9c86dd---37541353986.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070990931184---ronulumusufolexowat.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/91995856587.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/97347094421.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a4e41a776---19395403530.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0nc7uiiq0cu71gm9dcfe8rj7r5/romolomokub.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/katufajixenuxituteditate.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/166ce1104faf707c891dc9a46c0919e5/korisevodasiwum.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gq0lcmdblovjesgss90crfregp/70438126056.pdfIn PDF document text
    • https://defaico.com/d/files/40250617132.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/499652e70982503054fa3a1dddaeaf0f/41890756134.pdfIn macro / runtime command snippet
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088196a8efef---99530532903.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453cc93e31---sanawepemadizezuj.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/piwak.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/menixiwejumozibo.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/8593165939.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71574324442.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/sabof.pdfIn PDF document text
    • https://defaico.com/dIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hall+effect+experiment+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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10588 bytes
SHA-256: 0bbca56a9d2339dc1761cbd235662da043421bba0327fedfd2fb50c5f5780ef0
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 18332 bytes
SHA-256: e66f960892a8b03dd713c9245f8333d31a2614537adc7a184cccaf8c0b487778
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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