Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf1cf17e840d18a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-13 23:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 33f0d6accfc41a2d8b295d6fdb25da2a SHA-1: 8b8772fdb103618c3babc4768c94b7926374e910 SHA-256: faf1cf17e840d18aae1c97da317b7b0189bdef172a6d985c11dbd76192dd3517
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 0.9952

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 https://medvor.ru/uplcv?utm_term=convertir+en+jpg+a+pdf PDF link annotation
    • https://gyn-koe70.de/obrazky/file/91764717478.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/bawupofilij.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/tudizad.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/gumuwoditaxu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/tuwokiroribotazuxitigixop.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/13511317313.pdfIn PDF document text
    • http://guitarenko.fr/img/files/34199180162.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jevuga.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/makuveduradudew.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/momenaxid.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130bf13675---zezerorekevuzevejafobura.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/45042437990.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sofibi.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/guwamojuzu.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090833555828.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dolasizuwinibigeju.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/rubebugosoxerejolaxin.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4fc6cee37153baafbcbdca4a84811223/ginuxiwiliwododax.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/22851494344.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23dacf466---44326219664.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/63623218258.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/xuvukodanojidudo.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/24259427456.pdfIn PDF document text
    • 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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 14224 bytes
SHA-256: d1d8c421d81c009e98e00ecbc681310f27a560e014b1fad82d682e412ad9b348
font_01_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 10688 bytes
SHA-256: aff25d728bd595461f5c3839f1591b65fb3385ab1dc044676b313d4416c42c95
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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