PDF malware analysis — malicious · 9f86ddd57f25d2b8

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 20:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 83e4991e1f7beeb5a4910daf1cd758f2 SHA-1: 29191ca63888830c0995e28de7908c0bb71d6457 SHA-256: 9f86ddd57f25d2b8d3bfb00f6c315e430e0927ff8e25af829958d23f7e025190

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.8257

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://ketchas.ru/uplcv?utm_term=alpha+backup+pro+apk+download PDF link annotation
- http://wienbildarchiv.com/upload_files/files/49282266589.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161470919db47c---93842719042.pdfIn PDF document text
- http://gemmacapitalgroup.com/foto/file/loguteka.pdfIn PDF document text
- http://www.schule.havonix.com/ckfinder/userfiles/files/wemalavuwolojasumexogu.pdfIn PDF document text
- https://sanipacific.com/attachment/file/mitunebelavizopuxafifa.pdfIn PDF document text
- http://esenkardeslerinsaat.com/resimlerfiles/benosuragofimex.pdfIn PDF document text
- http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fanonodadibesajipe.pdfIn PDF document text
- https://trouver-une-ssii.com/img/pics/files/nozalelupesubedum.pdfIn PDF document text
- http://bodegaadrover.com/userfiles/imagenes/judisamemanoves.pdfIn PDF document text
- http://dailycan.com/userfiles/files/muvujunapeva.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9394b9034---sapojijonexafuxixef.pdfIn PDF document text
- http://veiligheidsslot.nl/ckfinder/userfiles/files/14740831827.pdfIn PDF document text
- https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lofazujaguwanonaz.pdfIn PDF document text
- http://noxsun.com/jingkelun/userfiles/files/20210902040851.pdfIn PDF document text
- https://laurallo.com/ckfinder/userfiles/files/kalabivonisevolepu.pdfIn PDF document text
- https://rubyyadav.com/nbloom/fckuploads/file/xunotiz.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/18629841511.pdfIn PDF document text
- http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
- http://buyyoutubesubscribers.com/ci/userfiles/files/sigebegovopufojoru.pdfIn PDF document text
- http://www.como-grup.ro/fisiere/file/85716541536.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q84qc2ch7e4c1rrl4k6hpelcte/5026393981.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/tiliwarufajitanizub.pdfIn PDF document text
- http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/90353896676.pdfIn PDF document text
- https://texasbordervolunteers.org/userfiles/file/11334178393.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/bepudupapituseli.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000caab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAAB	18004 bytes
SHA-256: `ba67cef3ebc3a8cc2ae6c4641f71c4554f92773e3405757220f34f3d7fdc9c40`
`font_01_sfnt_off0000f9ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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