Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e07777c76926f…

MALICIOUS

PDF

87.8 KB Created: 2021-08-12 21:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: adffe1a7e27f48e5bbaf5857ae1efd1b SHA-1: 32b89e1755ca94f72b15c7dd197a71bd98350115 SHA-256: 533e07777c76926f83af047552ed865d6ba0d6e78ec629272014ce8b267541da
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely functioning as a link farm. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious content or host further stages of an attack. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sakaryakasaplarodasi.org/userfiles/file/zafowa.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d4ok320lqnv3mjdvipds5rcu1s/61884440617.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78384184078.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/19pglu8s4sreetbrtamhrhvrta/84330260867.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83994992aa---264248958.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c640875b21---57642157654.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xalapeluluvupamaze.pdfIn PDF document text
    • http://sdds.be/userfiles/file/77718418515.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/miximafabevigebopomile.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/danaxinonud.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/18980058024.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0b7dc62f---48709738506.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762342cc7fb---18701679308.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/470dbd852c69a85711d2a872e8ce0c65/21395060197.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/mupozofokilusamuronolaju.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/86736634586.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e812cc47424---62231873319.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160abe42b2ddaa---dewivipegize.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627544691_1.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/bekagekufisusipegikupom.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-30/20210730115917201908.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/93145979810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+foods+are+allowed+on+the+atkins+induction+dietPDF 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 16600 bytes
SHA-256: b3d982f98ece7a5d2e81cad7025f626821b243fb4db5b15016fe167dc632288f
font_01_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 10844 bytes
SHA-256: 19dc9f226a3d781826a6d9dba0a2c9023bd8fc9f3137e70a8060eaa0e2b701eb

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