Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f02b08eef7d87…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 06:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b3770f0dc2bfd526cb9ae79350ff02a SHA-1: 46172144ac541d8379d477041d89536613f6511e SHA-256: ef7f02b08eef7d8705ad91d1209b33b227cb9540e13de18181b1d5331a70da01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://avphunter.ro/ckfinder/userfiles/files/31725664952.pdf In PDF document text
    • http://softwarefactory.nl/images/file/tubinexi.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gepezeroxewewu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/gasuzemomomofumigakerunoz.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/matomopero.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/zozuxilanuwuwesafu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0318b74d---midojij.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3jsqi9qb8s8v060n0405rq4pfr/nowumixavomuxokod.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/20e1830e42ee161421a66b23745f0723/navugugafarafofexatodiji.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jopudixiwu.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/morop.pdfIn PDF document text
    • https://12shio4.com/contents//files/liwepafonudixe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db5c55014---borapoxaxubivasidonejisa.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kuvipoxudirudibufavip.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf658d4b76---gipiwusagixipowomosuvugen.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/kufakukonokenake.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/6871417031.pdfIn PDF document text
    • https://webmenuplus.com/images/file/73402826465.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//67400380052.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/lisumokumugakinuba.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sobokobalunes.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/bapotowogoj.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/9866454429.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/43696285528.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/r2pkb8n7cbcpg4cjis6a6bks1s/zepevatavekup.pdfIn PDF document text
    • http://harlit.com/upfiles/file/79340962080In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=transference+in+counsellingPDF 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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 18024 bytes
SHA-256: 33786e70dfd779430b6101a10cdff942916a3f7c15587d584ce925ecb2c32e15
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 10476 bytes
SHA-256: f3b746ee05c120144704dc99d844de415d69bdd8442e27d748f20e609d267562

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