Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea9b6698c7f8ba…

MALICIOUS

PDF

73.5 KB Created: 2021-10-06 01:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ac1524db0643a3f01a1eb2941069692 SHA-1: d6c04230f340971f3d455e8822bb439c067d947e SHA-256: 55ea9b6698c7f8ba61d3b10cfc4f89fcdcf66a84461f012a6391a9744a95c11a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pixomot.ru/uplcv?utm_term=plant+and+animal+cell+model
    • http://youngthisyear.com/ckfinder/userfiles/files/fatus.pdf
    • http://nb-magnet.com/upload/files/8323673769.pdf
    • https://inverpalmas.com/aym_image/files/fixokib.pdf
    • http://montereypark.kopanramen.com/uploads/files/mibum.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19d8950a---99085062738.pdf
    • https://websbag.com/uploads/files/pibakawimelo.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a9fa7bdaec8cf36eb3903fb014b01975/90211013058.pdf
    • http://mmsmarin.com/imgimage/file/78058238254.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/vefidujezovuminatitik.pdf
    • https://contact-house.com/fckeditor/upload/file/44143391194.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1615c2e2b3a786---lozamuripilujigajezab.pdf
    • http://kruengrangthai.com/files/files/33644599454.pdf
    • https://koratspring.com/upload/file/dejerisaniver.pdf
    • https://annekienlen.fr/imagesfile/85537651451.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16155d3b3f1f9c---mapokidure.pdf
    • http://metalzilembo.it/userfiles/files/10340745756.pdf
    • https://ever-progress.dacola.com/upload/files/29973200391.pdf
    • http://spineportal.de/files/file/segelawuvepibu.pdf
    • http://ukwoodrecycling.com/userfiles/files/67184826966.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/gilugutudafimubirofun.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dpbth4t3idspb9tkeb15aqn9rr/bejubusaxujobogiminigipot.pdf
    • http://ymmicro.com/files/files/1175891009.pdf
    • https://ra7a7p-h3ba7.com/contents/files/80137034612.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zuzawunenebim.pdf
    • http://monteconsultants.com/image/upload/File/8180202171.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/netosi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be3a.bin
28c36281352aaf7d39973fdd67f6b70a0011bea051455589320cae5a7b664180
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 16688 bytes
font_01_sfnt_off0000e91d.bin
a096c90dfff68137ed9d57f52cc14b0e5115ee6ea3c93e82e62b0489a2d08df6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 10264 bytes
font_02_sfnt_off00010024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16792 bytes