Malicious PDF — malware analysis report

Static analysis result for SHA-256 013970527cbbed46…

MALICIOUS

PDF

76.2 KB Created: 2021-06-28 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7960f93de887699eb39a02f6b5e6aaa SHA-1: e3e114bbf0b0f0bd51e869f612958fa9c99ac4d8 SHA-256: 013970527cbbed4661dba659e3509714cf80e94602ec2afe5771304498468719
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/umlfr0jh70ifohf23md5tg10bl/xatoso.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ab1ce29ef932b6f5c275a2407de60b6b/savaxonerit.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b22f32cb---gopofoxa.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/49f850a600f6d18a9487c8af4d1a99ef/46401467732.pdf
    • https://rivaflo-south.in/userfiles/files/doziwuz.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/144f5cdc09b5cda808fd575fc01f6cc1/xiwowomuworegakajiwo.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3394d87ed7e1d4e32d928513008aa88b/sibafibaxokisunesaguwakug.pdf
    • https://srmhospitalities.com/images/bulk_images/files/28337229999.pdf
    • https://khangle.vn/uploads/images/files/49903345674.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c50404ae---10666188341.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nnddud7s8tm39qo3r3llj5jmf1/48273654295.pdf
    • http://seanmore.com/userData/board/file/daruwaxamejirevufiku.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/62e0852a472d5ade28b530e143ba8b42/34236986232.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d3a07a4b---dadudokol.pdf
    • http://altiro.nl/home/tjerk/file/satujowofezof.pdf
    • http://bmcnx.com/userfiles/file/guvezusirobezisetolu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2899668ae---77455651960.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca86d4e979---9921057256.pdf
    • http://easyreturn.store/userfiles/file/tematixakulezitixepedagif.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5i9v9f8akk38i3nfsjijpg1057/20951419082.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/79697107285.pdf
    • https://actor-conseil.com/files/file/wojireleparokakelaxaf.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdfc3a954---dojojelejamisivonuwa.pdf
    • https://vestol.bg/files/file/42714935885.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f70f32ecd---43641129020.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1qh6ll85oslhm0psr8l9h6ven7/39525928462.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/40vi1s27k4fao8a6asjknhcbj5/tiluxakule.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tracing+letter+h
    • https://lapdonline.org/file/demunofemogip.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_off0000c79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 16792 bytes
font_01_sfnt_off0000dfac.bin
79e4c5d69b931ded8a9d30f96f9d32d293c4468b112239ec1bd6183b3ce35c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16808 bytes
font_02_sfnt_off00010b21.bin
de6b08ccf05128f2bf891591871554081054b5ebfd6549d95f5ffc81600f0023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10184 bytes

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