Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b0d556693a10e1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 03:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48f8eaad126fe966c07d59b7dcbdb8ad SHA-1: dda54669fe9cf1a0aa7d0a8a9584ae5e4616e7cf SHA-256: 15b0d556693a10e186e8f7004e30da7df6e033ddfe4991470de81c5cd23fb4b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised or disposable hosting sites, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://brandnewgoods.net/userfiles/file/woforubej.pdf In PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/6552364626.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/55761168176.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/66796883175.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zawivobupabanu.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/65571031103.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dca4e2a9b60748cd18fd4c235638f3f7/62056643047.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd0a24ce---wefozewamo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/95279179468.pdfIn PDF document text
    • http://crediramasrl.it/public/file/negudula.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamusalof.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/94595226908.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/19336805637.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/85175269675.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/vowigup.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134385ebd813---rejowu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/62082448798.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xuxolaw.pdfIn PDF document text
    • http://arsvet.ru/img/upload/57187438100.pdfIn PDF document text
    • https://kham.vn/userfiles/file/gujixabexusowusem.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jogigedemunigixanaxox.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210907024519.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/70235818705.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/25864200864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+phone+is+trashPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10412 bytes
SHA-256: 92aa22012bdc5f805bcb30dc0634f55ace4782855dcb1a66fa9ac07144d0a9e1
font_02_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 17536 bytes
SHA-256: b5e8de0a52aea9e583947841283797ac61dc701a47241500453f4f2e4ca41123

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