Malicious PDF — malware analysis report

Static analysis result for SHA-256 74936a655f738181…

MALICIOUS

PDF

68.9 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: 4f20f564451c420c208afb545fe59569 SHA-1: 6455e54446f5fe2c2867094b233dbd311f2048a4 SHA-256: 74936a655f7381815cbd8487602cdc453020c36fbe851c39e79d4c26980ad558
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7996

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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

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