Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fa45fd764c086d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 20:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67bbada9c8fb3435918b075f2ee0957e SHA-1: 0efcc0b2920d98a4bbe65259cbe6fe9aaeb0b81f SHA-256: 82fa45fd764c086d52f029c07e13ff463b23bdf8f544d498e0150c3c12de25ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates redirection to malicious sites or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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://olgunbey.com/upload/ckfinder/files/sakakavezigukila.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/zijufejujewabimirujuvo.pdf
    • http://loscogliodifavignana.it/userfiles/files/repadurigozupumede.pdf
    • http://chatyzvule.cz/uploads/siwuxoxiwezuwalosubixog.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/7532812834.pdf
    • http://www.gdchgs.com/admin/img/files/96584275367.pdf
    • http://bobiniauto.com/userfiles/file/71881568205.pdf
    • https://bvphcn.bdata.vn/upload/files/gafijenutirepa.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fe0a8518f0d0743f8232459cfd5c5023/limamo.pdf
    • https://edouardweil.com/userfiles/file/6923491573.pdf
    • http://www.vljainandco.com/userfiles/files/vujikose.pdf
    • http://iberia-ex.com/images/blog/file/93816214599.pdf
    • http://topbuild.net/content/xuploadimages/file/40869727504.pdf
    • https://contabil-fiscal.ro/mm/file/miwowilidomutugoj.pdf
    • http://latexindia.com/userfiles/file/90817686570.pdf
    • http://euroear.eu/ckfinder/userfiles/files/rukad.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/87252014312.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3bc3ea421---rezobine.pdf
    • https://pecintajp.com/contents/files/gasuzugu.pdf
    • https://soosekszer.hu/upload/files/nojexanapis.pdf
    • http://soyaksiesta3.com/userfiles/file/vosapumitivuvuvazo.pdf
    • http://gps-tw.com/CKEdit/upload/files/minenixaxe.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/toninimadiwadab.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/puwuviladilalusumodameto.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tjapfrt93dupo450u0vbmfsckf/5237809302.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2cbf393535ba00b3fc7c4443fa2bebf9/mezogakile.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=moto+g10+antutu+score
    • 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_off0000b5ce.bin
347fd2ec7aaa56202d72de559b1a9f36b351b30f214f788f2adbdbcf870fa094
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 10532 bytes
font_01_sfnt_off0000ce0f.bin
ec0a3460650806f4c8409e006066f99c857ab1fc5a27a6e944446d6d0e164c81
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16708 bytes
font_02_sfnt_off0000f8fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes