Malicious PDF — malware analysis report

Static analysis result for SHA-256 a157baafaba990ca…

MALICIOUS

PDF

66.5 KB Created: 2021-09-25 22:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6543e1f662dedf2507bff2b9999b952 SHA-1: 0acf80f794ccf18601b7a330c28cf81e5dd71fd6 SHA-256: a157baafaba990ca31b30de33f5b41f47448faf581cf821af454907ec38e2bb1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm. The presence of embedded JavaScript further suggests malicious intent, likely to execute further malicious actions or redirect the user. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5117

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phutungvespaco.com/luutru/files/ruvapaxokopogifinirij.pdf In PDF document text
    • http://studiotecnicodama.it/userfiles/files/zodoxupofejo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551f211d66---jexiro.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/36037139233.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/60821706678.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614049852757b---tabare.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210904050723.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/83330822928.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/lapigibemigegugemisuboneg.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/79888106754.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/nupisiposijobuxerol.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eace7e8ad9---vutilagipukeme.pdfIn PDF document text
    • http://etkenkalip.com/files/sujatiwovazajazaxib.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/db76f0ba058c3d01d310f0d29dc6c729/ginavexozuse.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/4181317220.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1c0e60c49f2d53856f4b6f28460827a0/35652273248.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a0ac54967441c9817234dac823751579/budafuxirezulevoretosi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/69688135106.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/muwibebevetofeniw.pdfIn PDF document text
    • https://maria-galland.ru/files/file/97479107918.pdfIn PDF document text
    • https://ptogel2.com/contents/files/7305959719.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/25165745358.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614960ce8494d---42305736612.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210920134812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+call+2020+korean+movie+watch+onlinePDF 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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16384 bytes
SHA-256: 21ff0fa666484577b893cde44949c474e6761d487d85a0bac216aa5fca1775ef
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10776 bytes
SHA-256: f7f1d8aa52e23ffc498dc9a0af6b332b9d9e9ecbfdd661b73ad716b7bdaa68fb
font_02_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1