Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acac2c516232f3a…

MALICIOUS

PDF

95.4 KB Created: 2021-09-08 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9ec5576734672eca69f4b62229b7277 SHA-1: debad8ac967d2b39db7886063b1b92cbb1251c24 SHA-256: 5acac2c516232f3afb10c2b45fb8b203502e3687f9b317631bdb22a1993b931b
196 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://vnnc.vn/img-hdmedia/files/fanebikomeluxowovepel.pdf In PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/22429224683.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/zokoxuw.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/dufaparebigatafu.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/176736837.pdfIn PDF document text
    • http://tdbm.vn/upload/files/99998140536.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/91396743856.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/55348719976.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/jelatubad.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/40198543611.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd3a91bf6---7176120075.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/87059013177.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/13954757928.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/zobalejajerev.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/wupemebiradut.pdfIn PDF document text
    • http://chineseclothingonline.net/File/xiwad.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bf26de20b7fb9dff084ad2b232a13bfa/pekezatinasuwezizetuw.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/maxedoluxejutikal.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zujitixuvisisoxakamo.pdfIn PDF document text
    • http://sdes.in/uploads/pamenusemuwapujuji.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/pupemenozuwewedorinedozuj.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/619bb52435ebb8032fcd6eecdd206dc7/muserat.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/29425907193.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/79385959387.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xunutag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+word+software+for+androidPDF 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_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 10440 bytes
SHA-256: 419e3946fe05e9573d8bb9ab9fe9fb1108de0913d9a0766da743b587fc978cea
font_01_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14235 17720 bytes
SHA-256: 9e66c61723e89054b417469d1e5b500e83dbdffc14e45d48d1dcdf16ee57b136

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