Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e32b8ea12c49de…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 23:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b6911a1125b3631612c40e4dd5189dc SHA-1: d159b0d3228f5faebc1e71a1a35034420c51dedd SHA-256: d3e32b8ea12c49de3cfeaedab7b2c0f1009f36bb9abf2ec71684dcdec9c16dad
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is acting as a link farm, likely to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the sheer volume and nature of the URLs indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=beats+studio3+wireless+over-ear+headphones+manual PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oerdbkl1fkaabbp0mcir3jr6h6/69026881743.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/gubopabez.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/rsvj3qmkjdd5gr4dsenr6rdvc5/vigurarosanuvutukezow.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ma4rorj9gq30gmi1rpu012tmu6/34926820219.pdfIn PDF document text
    • https://faprosid.com/file/24391017445.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21352462482.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb7f62acb---57668772847.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4e6ba88a71343b206c86fc8ead302b1e/zovusaxoxaxopem.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24cf0ae4f---furusig.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/13205290506.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/21bc4786d4444be12800aadc7af61390/70952092867.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jepexome.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/guwafapud.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/20628210702.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82206111906.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/dazatujuxivewegazegax.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/vidoputifemafasojesovo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/247b45f91e8e816afe1009c2ae773bf9/rivagabib.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/7051056467.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/46535231700.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/60969896855.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87ec636e4---5337866472.pdfIn PDF document text
    • 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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 18768 bytes
SHA-256: f4ba5282cf2abe2a70588b560fc3bf4cd25b79887956414194c14afd9ae9df89
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 11168 bytes
SHA-256: f37f9ff7f70a5f97df1ee9a3de39d98597f5420d86b22c07668fcc664a772a6a