Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70951e4623ace33…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ad2edc4fe55863434e259e756428f33 SHA-1: 3e5ca6cdf0cba3a862db63a78eda5bd0ef8022ba SHA-256: e70951e4623ace33c656057a376be1189a65a66d3db845046597043ff5dc398a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many links pointing to compromised CMS upload directories. The presence of these links suggests the PDF is intended to redirect users to malicious sites or download further payloads.

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 http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/55302696128.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f325d4ec8---wobuje.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/34002844041.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b92ab6d461---zadoliliderajozakimedosal.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/7058830543.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/wimitabelegupud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d40fb631411b37c2af3f97a7da7e05b4/lumiv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/06f10822f3ecf52635ba010c0a876687/28807953265.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/15528197207.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/36576662462.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/zorusajajol.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/44059111115.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/58054801757.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/27960197438.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/kobajefuzez.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/85292084435.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/41glteiu3dguo9kivms47ttdg4/xajomofanuroviloj.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/jodujasasi.pdfIn PDF document text
    • http://rld-carbon.ru/file/50921225952.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lesesove.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/574539211e443b63351e57bc051cc9f2/64272198363.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2adea21a71b1582559e2083d401c9aa6/40274141565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=to+them+in+spanishPDF 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10332 bytes
SHA-256: 46470e1e0a0158cb86fb06e6a6b8621ee57d5f40ae904df9fa17ca38e00d6a50
font_01_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 18940 bytes
SHA-256: 52d9e73a1953bfcdfa20bb55ad833313866c12aa7a00b9d9b86ce64842d274a1