Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fd4e2c9962787b…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 10:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e00aaca6f8bc4bb4894df0732a7b15d7 SHA-1: 45eca41e39665cccfcfd75e2a4fa4c31c4f56891 SHA-256: 24fd4e2c9962787b099d342f17108f65236038a075b6bfe62ab3a648912ea04a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of embedded URLs and the nature of the link farm suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0782a5e7---62774236456.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f5d7088e7a9f65648af009810816556e/dewexu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609623ae4e1ea---virajelilabedogaronujuv.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9049708f---radalonedezupi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mowazixi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753ee1e7a8a---kofuxasofaxesimadosama.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/00uu23eep95qc9uvnun5o8ls2k/kuwesobagex.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/doxijonegux.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e2c215f3---bekobafoxorapazex.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608455f3deb17---63517569348.pdfIn PDF document text
    • http://rayanchem.com/d/files/7265005923.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095aef1a5faf---5274058814.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e73ca25eec35d5a2caef203bbe55e6f6/2274008681.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/437edce24efaddfeae3d72dde9b532d4/27174647165.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a069be688ca432f2187cb24fca69d259/79177156049.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e450df3d---fotepumedano.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/49873739262.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6a60fee14b07b7b39ad18bfd0e3e10a6/218456138.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff343eae5---retadukurumiw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51061cc83d---rawujo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a163854275f---47041619361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=probationary+officer+meaning+in+tamilPDF 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_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10764 bytes
SHA-256: 9b99b2c11d0dbd0f2eb7774edbc8f200f479cc78e0f119628b8dfa37d56f6811
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 17420 bytes
SHA-256: 9ca2dc41f71777bfcf2eda389e5648261c44ca94fd66c4dbce771505be800efa
font_02_sfnt_off00013e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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