Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe84ca74b981f901…

MALICIOUS

PDF

71.9 KB Created: 2021-07-14 09:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 602a52e5f15d9df60821f229fe34c3c2 SHA-1: f367a0e19a21cc431cf9e8559e76c4c786e7f9b1 SHA-256: fe84ca74b981f9019f71239c9ce6344bb969585b7ccb33f2399f5bb51c8e09e9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160806e5319e0b---senup.pdf In PDF document text
    • http://hoinhikhoavn.com/img/files/86663666188.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pexubolop.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c12685e2---79839683035.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mogividabufifar.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/70446315980.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tegixipafusikigifipamubag.pdfIn PDF document text
    • https://ikima.fr/uploads/file/10687049770.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/18687886832.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/919b992cc1960c7d03a1d949984eb464/4062060800.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/71788366479.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee7e30900---93519554657.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bfa833390c3fab1a2a23e27ad81872be/petoniboka.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3549846e---4948834754.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wosaxa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094dca894550---beletawasexiluworow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+book+of+forbidden+knowledge+pdf+free+downloadPDF 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_off0000b635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 16416 bytes
SHA-256: 0c1fbb4b179c28a7e62d68b036c601cbf10fec97f6a5024097f63461eaedaa17
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 10792 bytes
SHA-256: fc1ac81cb3c3d47a3d6ecbdcf3b88a5dc6746831b5370a303afa9d6df9e7691a
font_02_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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