Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc704d786cbc9f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 19:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4056c15c6f39c9646f152c952dd440b SHA-1: 83d988cd1b91c9a5f2b3c3491e348732405bbe7d SHA-256: 09bc704d786cbc9fc5a29528988a4568ebbc0bd86ab27d8cb8dbaed47fb4076d
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to potentially malicious sites supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8214

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 http://azizavacanze.com/userfiles/files/besuguweseju.pdf
    • https://skvely-kup.cz/files/file/bifinezukepukizur.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614349a89682d---vusokuwetuvozomobozigov.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6607f406a1df9730ae127f0d17917b95/90289765754.pdf
    • http://konferencii.org/web/uploads/assets/file/pepelavagotozuxuburixuder.pdf
    • http://tecniagua.es/uploads/ckfinder/files/73956178223.pdf
    • https://0922.sproname.com/files/userfiles/files/rogafididukedolowururiwaw.pdf
    • http://loscogliodifavignana.it/userfiles/files/savulevil.pdf
    • http://kant21.com/userData/board/file/molorofenekuwuwusizo.pdf
    • http://k3projekt.pl/uploads/userfiles/files/megefafotawuzo.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nofiwetup.pdf
    • https://tele-video.ru/upload/files/lomekeg.pdf
    • http://security-m.jp/tool/images/file/52352608600.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/zuburew.pdf
    • https://istruttorecinofilo.it/userfiles/file/mafuzizaxenafodu.pdf
    • http://gestioniarmatoriali.it/3156053105.pdf
    • http://elementyzlaczne.pl/media/file/rufupinosig.pdf
    • http://levne-pohary.cz/UserFiles/File/bafela.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae6188bd7---tibutirurazanij.pdf
    • http://canphantich.net/Images_upload/files/molizu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424567a600c---98298238364.pdf
    • http://cavusofis.com/images_upload/files/viselawukamatiwaben.pdf
    • http://tokyosushilohaus.com/uploads/files/kuzeti.pdf
    • https://oceanflowerhotel.com/uploads/image/files/86264593813.pdf
    • https://pavillonwohlen.ch/userfiles/files/situworonoxosajugesa.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec1fcceb3---28601302871.pdf
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/83266439095.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/44200316220.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chronos+app+android
    • 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_off0000ee6e.bin
3647fae492291b85b2776ceac2d175fb43e7bdf6719688db743946e99dd6125f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18056 bytes

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