Malicious PDF — malware analysis report

Static analysis result for SHA-256 676a19af49632bed…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 10:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abbe7096e7af17a3bee89bd605139ca6 SHA-1: cfaa13719696f59ad470b42df7651cf5aa235230 SHA-256: 676a19af49632bed68d5070d2a0ca6d4f9a0e02584dddd23a09de2807ba1caa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically containing a 'utm_term' parameter suggesting a phishing or tracking motive. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=michelle+roblox+id PDF link annotation
    • https://sesconbs.org.br/ckfinder/userfiles/files/17813014358.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jijimibudifomilumuban.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/76075839238.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vemogusaxugufavowamitu.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nokunakosogazekokawifej.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753f539dbb---gutajarokiwot.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/basemabuga.pdfIn PDF document text
    • http://fpole.ru/sadm_files/75412764813.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9a099f9c---pomavisolazubekujepigov.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kamimisarolurekezeb.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/bativivobex.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/nilerovonoxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd88ea374---11480166615.pdfIn PDF document text
    • https://avflash.nl/upload/files/gobonidedovukusoso.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/64642410557.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tokawenazotazag.pdfIn PDF document text
    • https://ysh.my/userfiles/file/vafuvaxawog.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/57774917188.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/rafosewibefagofigosudi.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/remerajesizoxexuw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cba537a4---71004673539.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kurixapadutedoraxabis.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/xujezaz.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/50399250993.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zogovozixakive.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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 10168 bytes
SHA-256: 7d69181d1c7d764817f123cca15544bfba56dd7086f60d25ad1a3cee7651d656
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 15888 bytes
SHA-256: d2b06441bc32c6ae7f1f329dc6670bb88f3166e86a4df7db7341f09b10a10575

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