Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a17e0ab30d2955c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a14d7ce06f3ae3c7f85e3654cb3e21a SHA-1: 7f4477dfb3df6818e8f6b0c35c85ac3313389a2c SHA-256: 5a17e0ab30d2955cf88761fd7f6cdcc955de3e7efe0d50d4825153f673714700
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features numerous external URIs, many pointing to compromised WordPress sites and raw IP addresses, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g13o9qcurp6jpd8avj202ruqj6/menupusiwipanazu.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8t03k9f3se2o2th3ueobiacarv/37814115993.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/85547064834.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cee829fb---sixovewab.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/82086869841.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084256120b7f---jababamaxodobofu.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/32004441933.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nasitidusi.pdfIn PDF document text
    • http://rsentco.com/upload/file/zojovavilugiferidaxalame.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608619532c338---xogaxem.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/74bed9d8a9fd276c7299dd44e1e79373/36694644212.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf77abfca9---51930097404.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/fisipe.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zokivezokugezavaj.pdfPDF link annotation
    • https://aedwea.com/upload/foto/kotugiwu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/770d472e70fa8ffac2bb729d11bd5c32/72491396889.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sidinuxawijupetuf.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b2410f8d---gisanoguluvubadorip.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe167037---48414945248.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f86ea8e5b1bc60090c721f68d5d1cb79/bejofikorofuwulofusel.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/vejozudofivusa.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8lsl9fost7h05qeeqcalp0t012/vobirikone.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pkv026dqfh7p2hkct0stsrrutn/90838223604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=voltei+chico+xavier+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 20736 bytes
SHA-256: 011cc36756576e670a291187c369d413d293fdca5d115c75a879dca99c97955f
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 10580 bytes
SHA-256: 51bfce332ba036db743ae9d311389bd781fafd566ff5af51f735a46efeda8163

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