Malicious PDF — malware analysis report

Static analysis result for SHA-256 623ee15608654772…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 15:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aabd6eda028d847c95d4652cdd771b6b SHA-1: 550d4c2c86f492fb153b448ab1f0d8437b28caab SHA-256: 623ee156086547724281d82f0e04e3b8d6929c4a74b88862b812389c41e9b42b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's designed to host links rather than display information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://666666.vn/upload/fck/file/wemujetujisibamufi.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nmtec84k356vfsfogk73m7n7di/77980475016.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ead24cf7e---pegesatutubiditolo.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2lg3tp9fcs3n5sug782k8oeme6/99341384156.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4815447810.pdf
    • https://girilawfirm.com/content_files/files/71809100559.pdf
    • https://shop-ecobati.com/medias/upload/files/66924031484.pdf
    • http://cs-web-design.de/ablage/userfiles/files/gagumevazupewovo.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5e5b7151---xuxebazakokumewo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b6cd3421---66462777161.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88ff2ddee---novopokusavemizeda.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m4fsfn0q7p0btpqniak2sbm5k1/kitozuxatujazamu.pdf
    • http://suamayin.biz/userfiles/file/wewusikaxe.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/jukisapipegokelivavotiva.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce01a1fa3---87205202572.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c797d4c9612---71666321293.pdf
    • https://blugarden.eu/file/noribotusizawewazewoset.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gifugesagorajopa.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/5020490658.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c76e90426---44553677499.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210609194914729890g35p5.pdf
    • http://dieta-plus.pl/userfiles/file/durusupabujitusuvejabon.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf58289662---84760803349.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c043b445ffe---getugewusomifezivel.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077142650526---69059486034.pdf
    • http://roland-toys.eu/userfiles/file/66276070474.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737bfaa5ee9---gosojoxovelijud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=absent+pituitary+gland
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
font_01_sfnt_off0001110d.bin
fda18aaf0b1e4c96224026aeaf9c54fe805a3f67e5c065dced6dbab177ca98d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10780 bytes
font_02_sfnt_off000129a2.bin
e14ef5c4f5dd08bbeacaa8251518ef837dd584d237637af40772db46f69653d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16936 bytes

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