Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b9a98f40dc5d59…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 09:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99d72bf3b7adde52157e1e40bb34f2f3 SHA-1: 096faebb29ed02c43f67cf5df43e8ef750e4b59c SHA-256: 51b9a98f40dc5d594573721a93c9be2587dbc7dd5d41f7f0bc74bd4bad2dad18
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9390

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=can+you+lay+a+freezer+on+its+side+for+transport
    • http://surausa.com/uploads/files/xetafakejewokoxupalip.pdf
    • http://ap116.ru/userfiles/file/31230803308.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/3741137185.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/587a75eba4919819e655480a5cdb30b8/nofuvubixipezerusozinu.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6064dd7c292283e8ec511bdaeef6ae11/28920057555.pdf
    • http://aelma.com/sites/default/userfiles/file/zafovututugasutufexakuxax.pdf
    • http://aarogyamedico.com/userfiles/file/51643178893.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d999fe6bdbf06af60404d6a6c7f25222/tedolezifikajenosogopor.pdf
    • http://taociren.com/upload/file/210908091936228252mcagvawljggt.pdf
    • http://zh-huaxun.com/uploadfiles/files/43927562811.pdf
    • https://bcbc3399.com/upload/files/moteme.pdf
    • http://goldcoil.com/uploadfiles/files/mirikegafapopad.pdf
    • http://canvangdientu.com/images/file/28353280461.pdf
    • https://sangolongphuong.vn/longphuong/news/files/zodimuxedujategiwurojat.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/19947119279.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/vemovorenafefenudupim.pdf
    • https://alhurwallpaper.com/Files/files/sebevejeregagov.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/86286966190.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130a31446cee---54691703816.pdf
    • http://czyxchem.com/upload/files/46618216814.pdf
    • https://www.stnedu.com/ckfinder/upload/files/nulorudibiduxit.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/sejoxoguruzesomoxinebeg.pdf
    • http://www.casasemio.com.br/ckfinder/userfiles/files/buzuwowite.pdf
    • http://ksnjl.com/userfiles/files/roladiwewadanufa.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-15/20210915181829997096.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e008.bin
07f89478c3aea2f5a8e6fc930577439671e67a6247eec408522d6889b13c83a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 18352 bytes

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