Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9dfc0c432df88f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 18:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dee4f7f2c606ea9066f9e99b6860ae6c SHA-1: 0ea04982738acb1db34a70c99f89998b8b262dcb SHA-256: 2c9dfc0c432df88f16cf79a0faf0607541229c3c77bc834c12eb1b006e0b7ab4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for malicious redirection. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://babetravelling.com/ckfinder/userfiles2/files/liwivakozenaguzelavar.pdf In PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxomivel.pdfIn PDF document text
    • http://parfumland.sk/upl/rozojemifevuri.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zores.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367e7a84226---topobiretalaz.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/43365621697.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zugakinur.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nidolefokogedali.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xuxusizewu.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47550969063.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tol5svhdgkmj60nm0riuk0la2d/33101504601.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2344ab47e564f0e1c9a7b58b80d541d3/20407103651.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/54485789691.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/59981646559.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/81503454685.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/36333516386.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/66884429194.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/77450036324.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/84144723694.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/31416162569.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/24340634753.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/4178647285.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/70712607744.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/1464381831.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/dexukatakiguxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=live+line+guru+apk+downloadPDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10600 bytes
SHA-256: 78fbc239d1eb5aff87c1232519699e5a910174bc020362abacdc1ada10a9f7bc
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 18672 bytes
SHA-256: 4d3e3dad18b20d6ceb3fd8e5eb1ff619f402f242f359276530574cf7e8c6e88b
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1