Malicious PDF — malware analysis report

Static analysis result for SHA-256 99243068f3a98e53…

MALICIOUS

PDF

96.0 KB Created: 2021-08-03 13:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23608b1a38c8f42fb870885e211c9fc4 SHA-1: 1f6e15d21f6e2e3543bce0ecc7e99d609b42cb2c SHA-256: 99243068f3a98e53eab96a7e866f1dbf98a6b66c949503f6ccc73b04edfa1ea0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage redirection or phishing scheme. The ML classifier strongly indicated maliciousness, and the presence of numerous external links on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab868b42546---97803591517.pdf In PDF document text
    • http://mosvag.ru/img/lib/file/fanupopugerofulexivujo.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/24185790539.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ab0138130---63553539432.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kukigatetoza.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/skt36428o4mf8e7id92nb9nftr/77353505009.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/xeragefugazo.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/duxeb.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/luserun.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/fcjibfmj1630s39tohglsi56s0/sogatexelepenuziponewinow.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/22172970622.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vuloja.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731b69ec032---jewawumu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6570f25af60f35de1e1aa0d62eea9f4a/zafas.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1c26b95ede2fe909ded835f6494bef61/30762290541.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mudijerewapatikapif.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/pidanetafixowunawudenuzo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f96ce2ba4bd---87604716378.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/potovewogoninazuwivu.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/zarozulewub.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/85598642239.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9c9ea16102a348dfcfff6269a75d0ed7/bifoxevik.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/31103250492.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/betukoravoxarebaburuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=work+energy+and+power+practice+test+1+answer+keyPDF 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_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 17700 bytes
SHA-256: 68c8f5e82731bf5d1fd09ca56c039c2f00cb91c6a381e17940790fa7b57a2e0e
font_01_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001587d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587D 10980 bytes
SHA-256: 2e09202d11c351a5a6e50fc7feff329882dc14ced4138837d77af9b2204c5eaa

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