Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4cb17be51f4b0e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 04:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fdd6b11f97ffe33728b38493add5722 SHA-1: b3e1ebe31b4460fee4f634eda42eab1e6e43d9f1 SHA-256: eb4cb17be51f4b0e80458ff6a4bf8406f9b4e53df3e5a5905ac999d2526133c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=how+do+you+make+bottles+in+minecraft
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092238f1712f---87029994458.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sm362kpk1eltjf5o56t83g82dv/labaxekomevikif.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lanutu.pdf
    • http://arqing.es/ckfinder/userfiles/files/28996834549.pdf
    • http://abwessex.com/uploads/files/nokob.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/69875877818.pdf
    • http://614move.com/clients/4890/File/21903747852.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b5a38e6a278d77ec26a0551870194245/rujorawe.pdf
    • http://qiuyutv.com/userfiles/files/20210609044944.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/gokodumojitew.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e41a5f2c8---7847199256.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/daaae259a75e5e10773f4b28587fbd7a/xuwonedinijisibonuvi.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d00307b5e70ef141062e57ddcffbe9cc/zulemekezenexomasug.pdf
    • https://buka.ru/sadm_files/vijebogakelugodujipig.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f01ecff43801c8b908729ddb63bc0e2f/gelipurugovunifadarapu.pdf
    • https://pointvirgule.ca/upload/editor/file/21995342517.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/83405980024.pdf
    • https://mvpartners.be/images/uploadedimages/file/kagofatonezewuxepumusar.pdf
    • https://my-natural-style.net/upload/files/jowujakakanuxomo.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7185dcea---topumona.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/rurori.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/magevovedov.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed9e308cb---kibabefasajikemute.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2b461660956a312493dbde49ebad29dc/86461921556.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/13200302987.pdf
    • 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_off0000e45b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16792 bytes
font_01_sfnt_off0000fc6d.bin
b0f73709c90ae7f8ab64dceccedebda021901d655c362f0aac2941b06cc7aed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 16652 bytes
font_02_sfnt_off000127b1.bin
82c0b8a6ec76a2cef7fedc0793ebd888ab89b383312df61fe30188b1e1eeae96
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 11160 bytes