Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8f05a855d468f…

MALICIOUS

PDF

69.5 KB Created: 2021-10-05 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74f40ad23407763c38180360550ae049 SHA-1: 3691532a4aac2876c4d981ad3873f26cfb9b8b33 SHA-256: 4af8f05a855d468f3c86d2660e5069bf6c3d1d254ad8eb2663e47df440693342
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tccepj7ttt6plnfq1dhjc5utu3/72507652888.pdf In PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/bumuxopazaxewaro.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zaxivajilimuvokig.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wexubulazope.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923810a477---dupugemalozolawozere.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109211830022592.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/92012428900.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/81089400219.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tezefur.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/fizad.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/46269857163.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333f67aa9b0---tabigelosugolumabi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/girija.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/vorukogeragonitaso.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/bitomagusirigizadano.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/tudakozuzelofuke.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/koxetag.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xusukogepewe.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2812f63c621904bf120958a0cac48b56/mujox.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/96755816503.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/panemuvanuzigir.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/lomutawubazaf.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tumodibupolitezegovekikol.pdfIn PDF document text
    • http://ty-int.com/files/files/35867519304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+crawl+in+englishPDF 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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 10596 bytes
SHA-256: 6a33dad668ffa5c19c3f1351eada1e00d401789c1049025360df65613d9941cc
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 14688 bytes
SHA-256: ad8651fb623d5239298b4dc6eb08a66f48f3ed0c4c6c44fdaf765ff7618aada7
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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