Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d2ad6a66a3ef6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c70fc242080dce1255a716e29afa7e3 SHA-1: 64467a97698f212d972cacc0beb02e57c3bd435f SHA-256: 4f9d2ad6a66a3ef61f030730aa4a60c805b6ae9ee7f9609661b7b017e077ae3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://seoulgreeter.com/userData/board/file/1491853722.pdf In PDF document text
    • http://luingpyrex.cz/foto/Image/file/peliz.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/jifefedaposipolajoridal.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7774bcff---80425814159.pdfIn PDF document text
    • https://mszukam.pl/dat//file/5260416225.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/zusabo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059ba5ebdff---85349957649.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20218311246322299.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e465d04054---44221943167.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/28952262287.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/suvofo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6776925566---15587099404.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/jekawozifawoxase.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68roa9h1prmt6mei4srq1p34dc/sovomemonubuzadojafon.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd885b1b9a1---susaja.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/sibenivinewevudevox.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/42878695469.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/96433130564.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/4496055452.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/jovigotuwamuzumijuxunife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=software+to+write+on+pdf+documentPDF 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10828 bytes
SHA-256: f998d065edbbfc005b807a85e273e035cd73d8c38aad9b4fab2f965528fb21a3
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 17336 bytes
SHA-256: 29704ffb40e0948c491cc08f5509142aa1109354a53caa843acfb4c029b60e8b