Malicious PDF — malware analysis report

Static analysis result for SHA-256 97302bed8f7766f0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-18 03:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dae8f16269b9d9fb772e5b307d0f200f SHA-1: 397e02ca4c8f0931395ceb11f3921c301964b272 SHA-256: 97302bed8f7766f0fab6a32da3815293d9d20c490d7228533ad201ba4e463ffc
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 CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external sites via malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b30a42432---59578670265.pdf In PDF document text
    • https://bimstudioinc.com/media/files/dagidabo.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/firugekajavowojegupafi.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/25504994768.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0b9a3103---folujokitodekebipalobepa.pdfIn PDF document text
    • http://otczenacts.com/media/files/12754735298.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9tcmjvfkhtll17hbofdrfte2m4/32858464927.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/852dcd6aa4b6b1b5a75fdaff870c43e0/kotaxo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/sg0vjtsbsts99qfqeqtsetkum6/99701364524.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30278626ad---18396242387.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b53253da229---bamovanafodujumobuxore.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621005211.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/72526965657.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/8957372242.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/45445044356.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/bepor.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/j9lkm961qa6599i4lod0o97ukf/fawobabusukifibuzo.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/lobokulem.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/66s05am6dpgm9eeujlsjaaveiu/62255357745.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0e588b741c46968f8fd3fbf574e1c979/fijifobofamijusuvola.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f1c544879---lalofijenapijunipelarofar.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/bekuluzifovumamofukoxoki.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27478129593.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f9f9264d945f9d8b21e7de8fbc701afd/pugulej.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fafda55462b74b3c7dbda5be813310f/48636599441.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608264fb867ad---58610988837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+mathematical+theory+of+communication+shannon+weaver+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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 11216 bytes
SHA-256: 978cfab655feace25f3b9bf1e22706121e7d822f2369e8674bd6f46e1006d627
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16868 bytes
SHA-256: f1c289d6819d77d49ce4c597078ee311e7a17f2b381c1d5091fea400f3bfa5da

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