Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d4ee958f2df83e…

MALICIOUS

PDF

73.9 KB Created: 2021-10-01 00:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8762b0ab647be9fc515b38f7317bbd41 SHA-1: 38c86e6f0f04d6f9dd4267169051ac2580c89e92 SHA-256: 84d4ee958f2df83eb3b1519cc317ae1c85521d6402d2ec58eb024f5d35badb53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of algorithmically generated URLs and link farms on disposable hosting suggests an attempt to obscure malicious destinations, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=case+550g+dozer PDF link annotation
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/sovukaxinufevumi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161380a1c95857---pivodimotupejibikudul.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xilum.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/linibat.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84c9686b---59634810984.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1c54ef---lezuxosujunenamijevumu.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/luniwenobudidodologanam.pdfIn PDF document text
    • https://armenia4d.com/contents/files/39724181486.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482328ac4a7---dumenafo.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/guwakakumuk.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tepibibowavorotarejizoji.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/suxawomoferigenimupono.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db09b6d98b---munewirapogefi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210906160617.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/60900250412.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/midofamizuluforetagunubi.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zusisokodez.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/norusugox.pdfIn PDF document text
    • https://hiroyoung.com/data/files/famovelit.pdfIn PDF document text
    • http://capital96.com/userfiles/file/63096917158.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/81209340383.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_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 18868 bytes
SHA-256: 9e79704b6fc979562f88ad9ae113784c248a461b1355c8ab3a7dbb3ce1c3dd6c
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10428 bytes
SHA-256: c3f59cfc4a42f70bf9f7619e32966a25ab5fbe9fcfcceded4f44c8d990ad7aa6

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