Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0d1f93ba446cb…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 04:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30beeb9d741d91f50476d6715906cd17 SHA-1: 3b968bc24aa7db5f7b054a55630ec697696b239c SHA-256: 33d0d1f93ba446cb596bdb7d21bebd8a21d5a68afe9a5e6783c3088f3e69ec2e
244 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript, which is often used to download and execute malicious payloads. The document also employs social engineering tactics, specifically a 'Browser Install Lure,' to trick users into installing malicious browser extensions or updates. The presence of multiple compromised CMS upload links and link farms further indicates malicious intent, likely for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/41rmpkh06gdqdnppn5fcs2qu20/leruzunekebaxala.pdf In PDF document text
    • http://kirilmazbardak.com/userfiles/file/mawoxefedubanexew.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa76fddecd---zanasixe.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cqn1ceqrbi7r394iro08pggl22/jufimaxu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c1574e2f36ac824fc263e6ec0b61e5a/62735757241.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jusekizivar.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076322dd1326---96151941797.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f55e8de0d---74919240401.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/limamirekone.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/64471077697.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4195fd77a9---pelemi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3299a57a84---94647618011.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/94715691849.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/weletusoxogaf.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9qug24rh4dcds3ijpvud2qo9kg/54573335787.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210618_E5A25585EC8D5D3A.pdfIn PDF document text
    • https://emmaushuis.org/pages/lokigofopavo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/16534571373.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859440314ec---85376066613.pdfIn PDF document text
    • http://scro.ru/pic/file/madegir.pdfIn PDF document text
    • http://zuche0551.com/upload/file/30177445315.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6o2m98iv2a9249brdb1isf80l7/59085232461.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/fikowuzo.pdfIn PDF document text
    • http://4bx.pl/public/file/28165116950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+will+send+it+to+youPDF 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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 17032 bytes
SHA-256: f262eca50d3f0c4774fcb4d40c12da911a96805e890b13a0b6c663bea78c5e3b
font_01_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 10232 bytes
SHA-256: 731e71a87bea979097b6150ac7ad53fab26abb4df2281290a0e8ec286a8316a5

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