Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c857a6128ea86b9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72b4aef92b4171868b886ca316f79c0b SHA-1: 04a955f1352c63fbdb08fc179f52bc35d6acb3de SHA-256: 9c857a6128ea86b9682d09ad0536e9f1a58dd07133895af058ff84eb7c8daa41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://philabc.ru/uplcv?utm_term=i+prefer+synonym PDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132908536469---20172315077.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b692679ec60fd3e83635ddc3be2619d6/22268212771.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fb4b8f63---baxexijudibulebawo.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/64676223938.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tezapumewuliduv.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/10813590407.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba758f1687---juvetifitixopogik.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/jizawikepavezivenuzefopax.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/57009049947.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/fezifod.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/voxajuta.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/zozibopukipasafusamejife.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/navironisuvukopuzi.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_1E30F2E464AEA547.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219121437566613.pdfIn PDF document text
    • http://forti.in/userfiles/file/binoguxuvinufama.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/faranagev.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/zugajo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5740029c1---40968302145.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/bobubaweji.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/sewivupafikagilosu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33781285426.pdfIn PDF document text
    • https://deepex.hu/hirek/files/88507994843.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sqtlbdisqjts583tr4g7u1qfpv/kabetividesixegavoligom.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10188 bytes
SHA-256: e30f9ee455a4a56508cf8a683a26b14702397ce558575d4a223d71ee5451a8bb
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 19208 bytes
SHA-256: 23fb7374a3dd91dbfcff158dc5db70bf3b7ed422ae3210e886672c61403bee2d

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