Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b31bd13f8ec02fc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 13:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da609cd60dadaa20313d74ff5be01e17 SHA-1: 4c40aad4c760bc5290768415e83cbdafa89097b8 SHA-256: 5b31bd13f8ec02fc1ecce591db83af77de884a1858a21625d611871758a0f1d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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.darvidproperty.com/news/file/vixapegus.pdf In PDF document text
    • http://pusancard.com/userData/board/file/90550368801.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/27565813256.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160712cb6d747d---nijetewamexidiwob.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/987962389.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/sorotat.pdfIn PDF document text
    • https://vpmemorial.net/images/file/1520370160.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/63452173017.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc195d0e31---xotavizoxajexu.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zeladipajaposawikaxe.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/244a0e050513baf3da8b5695e187f96c/75831245915.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c42ec9586173677c105358afe980d2e2/62999042610.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161239bf413efc---fabojijilogujisapatumop.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108bb2cb8c1f---fowukex.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/popewosoririv.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/jataxusosawuzo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/fapanuxasetesifipuv.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/40422106824.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/lojebuwufekumawime.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/03ed1bef85eee3fb5662b5466010b96a/marenidizoju.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/pedexusewalupumajaweligu.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/94345706695.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0792746001625492937.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/pusuposovugoridutijeteno.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8da2jsh1qb42raokpsrtaadn73/sijose.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01bd86704---82187484876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=r+and+b+bluesPDF 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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10116 bytes
SHA-256: 52750f36d22fe39d860353617c18b9f1babbbb77f64307d176ed663bf9365260
font_01_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 14120 bytes
SHA-256: f835f7f97fe57db6532bffb341644ff2f66c01e09e737c84aac2f12258382552
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1