Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ace7a596d9bd98…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 09:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ce728d61198d03e959372085da7098e SHA-1: 24cf804d90964c6d073100165b9524c57ded88bb SHA-256: a4ace7a596d9bd98fc62bc137e02d484ee76ff831348a398e4ab5b8cfcae330c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fm5it7j3bps0rkl85v0tjh61ks/gifebojebifibadifepusi.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf74dcf69---5348222743.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609472f1e2ce6---nuwakalupomonezatapad.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075478ee3804---85877959585.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e070741674112c2876d11c68fba367c7/limemokivebejizefekub.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3b1eb7ea---74098489331.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mi9tsld9ni691o9dvskb1j7kbn/33578437072.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091a6e7d5657---89117614543.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14350957175.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8763275409---zodafugutojunidig.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bdd081e643cd6b70fe7dd32e6879afe9/rubisuwasevajililejobeka.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ca8b26060---6582608842.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zimimarofiweduvofoseti.pdfIn PDF document text
    • http://cartopack.com/Images/file/moponadapa.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/34810809223.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nuzizepufagotewaxetef.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/rewevorekaritexudolufapox.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63784f775---gegalogukanaj.pdfIn PDF document text
    • https://atl-50.com/files/file/27659565423.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d11643716---30656327367.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/godubab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=baixar+o+livro+namorado+de+aluguel+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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 20060 bytes
SHA-256: 808848aa6067d13d8ed0ef5b04928d9273f2a5800c0368f78c2599ba2366a5b9
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 10896 bytes
SHA-256: f47e1f826f213084733f58dcbfeb0d05df2312d11f4e388f93c1cdd65420b4de

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