Malicious PDF — malware analysis report

Static analysis result for SHA-256 4772de1e9542ccbd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 10:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6298e3ed5777d4966a1628078e268941 SHA-1: 7ecf22fd1642296050bf89b6d26acf9793a263f2 SHA-256: 4772de1e9542ccbd42055be9230c656aa69feb93faa8f308a40451298004fef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful content hosted on these compromised sites, likely as part of a phishing or malware distribution scheme.

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p33rrmojh5si85kn1nvvnjtl80/13945034766.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ije75h59h9ph3jdcg2pu1gi6bl/kawezepojosenanisudurex.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb7ef1a00---33423170047.pdf
    • http://loadcell.vn/Images_upload/files/72259007125.pdf
    • http://nhs1980alumni.com/clients/878257/File/jobanekavalekoposudod.pdf
    • https://acryl-bg.com/userfiles/file/gekidavalemobomisepone.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdc044819f---nimokalanada.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c65efef53f---xejizazenugulaxulakow.pdf
    • https://gulfb2b.com/userfiles/file/kagaverodo.pdf
    • http://rc-modeller.se/images/file///nomefubidujejuguzap.pdf
    • http://kaies.cn/upfiles/file/wapufubowaxofez.pdf
    • http://swaminarayangm.org/userfiles/file/ronomapuxebotekijebuloj.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6cb820054d2d40a681cdac6e98b1296c/52942162626.pdf
    • http://kozszemle.hu/uploads/files/34732832025.pdf
    • https://fptica.ru/images/file/manajijav.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/4599364817.pdf
    • http://www.hangmandigital.com/files/file/73352119967.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/rexevexaxefepezebukuses.pdf
    • https://vivekanandbawwa.com/userfiles/file/98292196505.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d8bfb1ee9baaa7e68377138646353141/18147432247.pdf
    • http://caf-ljubljana.si/docs/56994695521.pdf
    • https://khanikango.in/file/wufobodijajilokumasop.pdf
    • http://ac-kenigsberg.ru/files/file/dilemavuxademinoxi.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/77646145338.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=domestic+violence+prevention+and+protection+act+2010+bangladesh+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_off0000b5a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 16792 bytes
font_01_sfnt_off0000cdb2.bin
6e136514e56c0f8b1df1ba5de75dc243a375244b2106a4877d2b2c2ac2e36da3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 15248 bytes
font_02_sfnt_off0000f3f0.bin
3a85bfdad1fe574f80c7c028756a2a22613117bbdbdf1ea65e41b5c52e13b3b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11568 bytes