Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2753a43ea1792a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c4dabb3d2de554aa601935336104893 SHA-1: 0c847c014328f4050c483e355c6ed5cb8e6ba9a2 SHA-256: 8a2753a43ea1792a0e636292f7aa99c218666cfb375cfac163c0bf9b5d120469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=watch+master+in+the+house PDF link annotation
    • http://german-ex.com/images/blog/file/62275253951.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/98646367752.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33f9b155e---tazajexiluk.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/81994951273.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01318a89c---36331278303.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/30744970373.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/3497654727.pdfIn PDF document text
    • http://davcpundri.com/css/file/tuxasefemuvoxise.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93981920698.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061114504932.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/43968074497.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/nenireforegin.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d4d2c95b---lulabobunefizotimawe.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/kewalom.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/90535172777.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6dd026a---wakaverosogulage.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cbd4ab9efa9eac3015d20d7fa747d492/95254895790.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/83852707362.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/gigezemoxuwufedujaxenev.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/funukaselulefutarimadadez.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/mekejibexesawovi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1bb51964---21597290834.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_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10540 bytes
SHA-256: 755fa51435055f0b9775e8345e4ada6ae99596f14fa2930ecbef9b7d99a543de
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 18376 bytes
SHA-256: b4f2d08744416b2aed9b725e6cccc81c4241bd337bee0c1a3ecaeff4c3a921af
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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