Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35fc443fc446461…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 03:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bec6f479cfba7dde181a26a629c2308 SHA-1: 53e81b9dfd3805092a76041037a74411f65adfec SHA-256: f35fc443fc446461ff5b47f73189b5dd3b56c37bea89493539990c86a45d2577
96 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting a potential SEO manipulation or redirection scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc10dba63e6e185c38a5a189fcad377b/foxadinesetigewapujorad.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085162b649ea---pesobezimi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1dc1b8bc7575f612fa5f27ed884bd26f/40102437147.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/piviligituxunoje.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7ebe4847---83252395158.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/92466077638.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/24876890886.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/74898246192.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3l2o1cu4v5v7e7tihb0nerhkss/88460518459.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/marisenajipalatal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079749c6c5a2---gefemibajotu.pdfIn PDF document text
    • http://93564497.com/userfiles/xadozazatomud.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26318388799.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0ul99pvfnp7ra2gngm3cl3kdag/pujuzerirexefupi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdec71b6a59---gifufasiridalawifezizimel.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/93869721775.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070157af2155---9921512456.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/86103592789.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8cfc6ae8e1ee6621b4efe924abdfe70/99579929798.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c235bacd556---34896817284.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r26e308hqf00drhkqkk6gftm3f/miwesufasonobebagazidami.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85673937372.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8652ef85c---7916698669.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/paposevized.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mein+deutschbuch+modalverben+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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 18820 bytes
SHA-256: baeecdd52609a8bab7c902c09bb69120939e753a015f448823a8d0ce312efa2b
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 11184 bytes
SHA-256: 7accda5b50f318cdc640e177408e8b9dccee6a27375ba341001b4d6da8b458f2

Open this report in the interactive analyzer, or submit your own file for analysis.