Malicious PDF — malware analysis report

Static analysis result for SHA-256 bead4c3337251b02…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 03:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 488d744629455badc275fc728e9a2e31 SHA-1: 6e97601b36689896e15e53383f8b01aafa8c7dd1 SHA-256: bead4c3337251b02ce09e749e9fd6d56b40c730c666e7771ad5814789c42b423
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338ec9cc3e8---3087621375.pdf In PDF document text
    • https://badrivishal.com/media/feduxij.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/xomatidurodumi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16148f740a98be---xixotobepedo.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-05-29-07-55.pdfIn PDF document text
    • https://salonrewards.ca/images/file/xawilogixexaworapeb.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/samafadibaxirifekujiwu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/47480386584.pdfIn PDF document text
    • http://farashimirooz.com/files/veziwelirelafuriba.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/30947783717.pdfIn PDF document text
    • http://ty-int.com/files/files/wezenunofiwomijasisik.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/tofaxegidixedununorupid.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/52964826929.pdfIn PDF document text
    • http://deauville.ru/files/file/76186200730.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/lijojigixilajap.pdfIn PDF document text
    • http://zerosquareonline.com/file/renurom.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210919183151.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/sipupejatuvororidom.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16321320223485.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9a377ae5b8ef09dc96f198b77266c5e3/3180699547.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/13342807145.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/99155213056.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/karigulogidakitemuti.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/88469500834.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/wigolixuvafibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mar+gaye+loko+punjabi+movie+full+downloadPDF 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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 16148 bytes
SHA-256: 1812ce3139c7d2412ac9c4c1057b5bf20ed36f4831903d814cd6910884cf6942
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 11296 bytes
SHA-256: ca93a16c8c8d2ad850cc8769ffeb90fa4aa92acf002640315ba0936ac857f6ef
font_02_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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