Malicious PDF — malware analysis report

Static analysis result for SHA-256 949d2e5a89731459…

MALICIOUS

PDF

68.6 KB Created: 2021-09-01 04:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e5266ab98e12397f4bbcb4796496b739 SHA-1: a407759374f6773178066bae37f36a690f27a6dc SHA-256: 949d2e5a897314592719a64d6e6c563626f77e94b42632114ba9a38e416fbf75
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 0.9982

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 0 text block(s), carries a click-outward action, and is only 68 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://blueyee.com/upload/file/110826329759.pdf In PDF document text
    • https://tavio.ru/files/file/wusejo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/wegafubexasonufinunaguz.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/52258237377.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/68157910157.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1e3b6d6b---18896605151.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6f907183567f33dde8d2c2239b854845/64996102009.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d22b4476aef8cacc73d5551462b86a25/sosorosejivixikodasiwi.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fovanadibapevasazuk.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/653918438.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fusufasatigolig.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/276f74a7ee79411463591ace02b277d5/69876940963.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/39913072363.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/86303375185.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/musimukafiboweno.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tasakuganoxepi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7fa00f0fc44c29dbacb8045233875d95/46551058282.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/54306157732.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c7a90061---68861464958.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77597858542.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/26887542956.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/640eb4ddb21b535192d4bbc7f76af169/12721691141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=when+you+kiss+me+on+that+midnight+streetPDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 10948 bytes
SHA-256: 1875bb2cb3217a2807b8b86a4486e115b33e3e5e48d2f32f049a95a60f9d9416
font_02_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 13520 bytes
SHA-256: 0c579e0d97cd7f53ba5495737be95abf56dd84f57690f5f515e926681a768991