Malicious PDF — malware analysis report

Static analysis result for SHA-256 e662b351a4dd2fe1…

MALICIOUS

PDF

107.2 KB Created: 2021-09-16 02:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51a12b2c54d3c81a2ee22224315f1730 SHA-1: 027c98dbda8b0210bbdce80953ae786b749d69b8 SHA-256: e662b351a4dd2fe1ce5940b17f727c75388cd2728dcdf5a22c065dcf00524237
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and link farms on disposable hosting. The presence of a visual download button and the ML classifier's high confidence score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggest a malicious intent to trick users into downloading further malicious content or to exploit vulnerabilities. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=chal+mera+putt+2+movie+buy+online
    • http://meyanko.com/userfiles/file///16072449811.pdf
    • https://www.znackakvality.info/files/92856453036.pdf
    • http://sor1310.com/userfiles/file/93556414678.pdf
    • http://scsychem.com/upload/files/dajiforizipa.pdf
    • http://nattukoottam.com/userfiles/file/18545572403.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/witazopegojawenigisidodog.pdf
    • http://burattinojatek.hu/userfiles/file/39271380745.pdf
    • http://rungrawin-itt.com/userfiles/files/baloditisewekate.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901184813.pdf
    • http://vietdubai.com/userfiles/file/82346776641.pdf
    • http://kfoodntea.com/dataroom/file/zudiruje.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/7315629745.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/wilusaxiguwosokadagomevi.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s73b07v83uknf41kj4mhgq9jhu/gilenuz.pdf
    • https://kovrdom.ru/sites/all/sites/default/files/file/14322829405.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7e49de2a---92715648276.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/26190396117.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/23122080994.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/filarumimikimewitinepe.pdf
    • http://aktifithalat.com/resimlerfiles/16208838782.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7247391082.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mqq4kededhg31gel9je7n06s78/jobatasevuxefufiratuvub.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139357c179e9---92232840919.pdf
    • http://flamefitnessstudio.com/cewit/images/file/mewakuduxipexapijogiz.pdf
    • http://mondoacquapiscine.com/userfiles/files/voxujofa.pdf
    • http://aostavet.it/userfiles/files/fesojefovazanasupal.pdf
    • http://tuzvedo.hu/elemek/file/duxubamumiwuloxilapa.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_off00013946.bin
7c45b3b76007080aed25aa35ae54f98e7cde63769bfa1a7a9c9a51e3d580527e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 19960 bytes
font_01_sfnt_off00016d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D83 16792 bytes
font_02_sfnt_off0001859a.bin
e3c6e6ff39a98c5b838bde2c140a187937afe7cd41daf79b0a568b2de7291e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1859A 10920 bytes

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