Malicious PDF — malware analysis report

Static analysis result for SHA-256 625950d16f2e9ccc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 14:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f65629b3637e5030fda241a6d3d3b7bd SHA-1: e2845c3a4104b4b620e56506eaab52976e37aaac SHA-256: 625950d16f2e9ccc9bcecf4dd467dcd390e7f80d5c57d811a6d1cca70ee2fbbe
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e0128466---10226077226.pdf In PDF document text
    • http://wwstationery.com/files/file/21674975693.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nokemuwil.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/xonimu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/zidipuwerenodiki.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5d4fd93935ebc24caca24187758e5328/89333630352.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/jutovibefifidexapegixi.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/nutuzepafuvetixuvadununiw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613219dd6fa40---mametonixapexegakibivo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/lirimolune.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zapupojuxafewuki.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/gezepulefosivuvek.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/86144576176.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/67339389079.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265f734ddd---wubugaxuxopujodigobuf.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/nujebiju.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210901163757_1588303069.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/6788519886.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e82d1aa94cde72c8c58c12a13100935b/84440975953.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/lulututuwori.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.pdfIn PDF document text
    • https://labelmarket.eu/data/file/10267971528.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/noxazutigeduvo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/daxegowelojida.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/jakadotozejagewujevidewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=easy+market+apkPDF 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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 10240 bytes
SHA-256: 32c1fe9d8d810db74974f79f2403439bc13e57480c603a619deb02241d8cdaea
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 18316 bytes
SHA-256: c654d9f0b295a4eb7f82af33c75d36d277a7b904df7dc46ba4ad07572a9cf573