Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a39298b7d86f3b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a9230838c192ab104b665ff17fdc2d5 SHA-1: 6fcd9941f5643709587cd4eed5fe1a26c35ac87d SHA-256: 07a39298b7d86f3b6d3aba7424e8f3c64117d92291440a2ba99bcec35d15ed8b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple external URLs, many of which are hosted on potentially compromised WordPress sites. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm serves as a lure for users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mjr35145nu5pk6p4vv2jksl4v5/93636441321.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40640822762.pdfIn PDF document text
    • https://yodobashi-church.com/65185445939.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210917030223.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/48355301587.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rixixurifixug.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/feresabuk.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210918191752.pdfIn PDF document text
    • http://ternovykh.ru/content/file/fimupapewolu.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wapegedotirigabibitejog.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16317648152425.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/metevomonip.pdfIn PDF document text
    • http://ipllaser.in/uploads/dajosuvuk.pdfIn PDF document text
    • https://aayams.com/userfiles/file/webiramuboto.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377797b50d4---49965938760.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabae72fb6---xomofukigamomaze.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jatojonurugomavogoxu.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/dogorisinuzonekisegupudi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pisozuxik.pdfIn PDF document text
    • http://potlista.com/file/files/jejebikoxevonemido.pdfIn PDF document text
    • https://n-tlg.com/files/file/pamix.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/4787660553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+format+full+formPDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16884 bytes
SHA-256: 3e33a4ac6ed042b70edb03366858149ad017291aac6df5284b76b34952a7f501
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10120 bytes
SHA-256: b1f1e5bb82a4735c17d04281af2a9b377c5fc5933322ca88e536f852888842ba

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