Malicious PDF — malware analysis report

Static analysis result for SHA-256 337385652c44c5c6…

MALICIOUS

PDF

95.8 KB Created: 2021-07-16 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2439144b1b4528caa7533b89953a5c3 SHA-1: b0c7710fb3e92e5fe1a5a6861f62d38b079edc22 SHA-256: 337385652c44c5c67d6f3dad4262d71f907b5b6e6ddabbccc1222fd5abe30852
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicates maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://centreforeffectivecoaching.com/media/file/logubivasa.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/gavedomom.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/ximam.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a120ce514---95519698409.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/56566311168.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j3mvqd0d04mkcr6co6qoeum7c2/zimupowenitabusowij.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/51668225889.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/469b5b997ed239e142b438bb20596964/56494253126.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/98s2unukssjthc4e0hqbq7juc6/minekabesev.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c64da57---16026582253.pdfPDF link annotation
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/42594610841.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ec70bfa8e5afaebb77d099259d327d4b/zirejevaburulido.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/66382309454.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/32072992104.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jenepipil.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/u9b58ll70gt381lvftim96pt11/1135262553.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b27c04a4f---65925955835.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/52089162327.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/186ccfe278a8bce36548fbed235bc9d0/jusapikitukolipa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bacab6968---netomimakaxojoworuwiwaxap.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zulas.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ab1a80703514323923f10c27f79c55cf/92083244435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=intangible+assets+accounting+definitionPDF 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_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 17164 bytes
SHA-256: 14ffb08f3777f6bf99b21a38db47958473f4cedb288aa168ec5a97399e369b4a
font_01_sfnt_off0001416e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 10740 bytes
SHA-256: a2ba3ea25bffabeffa6bbc51b7d358934a6a7d516b66925bfb0f625cfcefb312