Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24980b8ab3c70b1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 06:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8deb912343dd7d64dd5a7a94a5aa34dd SHA-1: 1f5587102acda6de85cee63c602a68ba1ac965fb SHA-256: a24980b8ab3c70b1ee389b0bf9aa0798e634640645b5f46ca6596c04cb201198
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

Heuristics 5

  • 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
  • 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://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