Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89b8dc0d34d563f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 07:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c4212c6ef4d175e92b2b760e9a93698 SHA-1: 3eed2299a76d06e57dc60f0bf0f363b33e063791 SHA-256: e89b8dc0d34d563fa615118687ee763045d0b8b84fd82f3e3616e1da962d270b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users into downloading additional malicious content.

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 https://chowdhurytourism.com/ckfinder/userfiles/files/wamomovafafasul.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/66b3f46114aec84ea470aeed14655fb3/japubiwebute.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/37421846595.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jukudofekazilabovodijudi.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210916_061311_145.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614215a20bfe5---58817578812.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/91612430773.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/pexonizojezutuzav.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/5015168862.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861ea0ace5---jefiwutamidoxiwewigafi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917001736197.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/65022884127.pdfIn PDF document text
    • https://mentormedya.com/files/83220109822.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/gonudisipilo.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dexukonitasatoxefom.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/wonimakatiwokesiwirowiwal.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/78259941912.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vikisoxav.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/61952796767.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/45927388598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+knight+rider+2000+123moviesPDF 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_off0000bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 11388 bytes
SHA-256: ffc442a95ef5febe5748e714d38eca39d8f8fd2baa32c77ad69eadefb72ee89b
font_02_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 17472 bytes
SHA-256: c17d50bdf4d5324e321fab3d2c629fd56f1cabc7935d05eb256fa7d6d4cff967