Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e8335fe5cb15d5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 03:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da2594557575c4033441f88f7a981bff SHA-1: 2194cc2402df716cb64ffbc0068168d5a1357ac8 SHA-256: c9e8335fe5cb15d5bbf9cc998008e98adc1d13193fc64cc3a4fb955891e661e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the technical metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gruntbudowa.pl/files/file/bivofijepaxep.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983387d0b7c---wubekiwuzopulerajado.pdfIn PDF document text
    • http://springbook.no/files/jiwezofubalaxesirolikena.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0tumh9alt4u3s065duodnmd0nf/fudepuxolevuwaxajetogakeg.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8800a452a---bituzozusuxututeberenu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/77f831504456c5eed9947a07aabbde5b/25633417792.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/1406164864.pdfIn PDF document text
    • https://medius.sk/userfiles/file/50069973994.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b332a78c1---zesolowuxejutapifet.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/15846514834.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f7d9272866ca67c46344418b1c912ca7/nasugetunulopetuxi.pdfIn PDF document text
    • http://daydala.com/userfiles/file/74758985341.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/sigufofe.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/zozabexidavedeji.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/69895154151.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h97vmgkcol80qrdcfii4d6ur54/sizalufiladololikuvu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5a5927de20c3078f4440155f133e7614/15771555699.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/72703364291.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/65623162217.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290dc6928f---jenukoratigufezoluz.pdfIn PDF document text
    • http://tai-group.com/upload/files/75398655871.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd4c67918---22190146848.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/36189341015.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde8278c33---45474280248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=linear+differential+operators+lanczos+pdfPDF 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_off0000bc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC25 18048 bytes
SHA-256: 45552a74dfa577ba3b336e796489bd84824f468dc27d21439c3d46db8ab9a7a4
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10628 bytes
SHA-256: 76062002772bc58ac0c623398b6d58fa18b7af9287ae504cce2a641497b2855a
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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