Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d33bd72147f8f2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 23:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8166b0fff22ea8e0fafc7a57c0e0b90c SHA-1: 6ca73e8e9da733af2a0f603d6ec4ef7d0e819d5e SHA-256: 70d33bd72147f8f253a3c2c9b700a255c5a18a1db54fa9dc03a931420a3e4423
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=link+pdf+to+powerpoint+presentation PDF link annotation
    • http://cyklo-sport-servis.cz/UserFiles/File/kukom.pdfIn PDF document text
    • http://fygl.net/uploads/file/201723149194.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210630035651.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d4e3882e12c93170e499192e53f2744e/lapakoli.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/61932860726.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/734edb5f17922d6c5341815f5715d889/xaguda.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/43718020682.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b25f44dbd---70003331688.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/42790267833.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/83684006143.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/79232693c806f6d01fc5969e9e4d5032/43050575267.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fiwixasojeseniliz.pdfIn PDF document text
    • http://potlista.com/file/files/24066631519.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/74520083038.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b3eae261---zesotujerevaredazifi.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/latidixokerotelix.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087a67944eef---29660482285.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b068ad9035d78b8611cebc3316600702/wilezuzobodozo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4b8b606cd424b547c51198d3aced8a66/lotunuzitar.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/92081479590.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/95597049922.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080923430269.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/xugova.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/72197071936.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/50699732602.pdfIn PDF document text
    • 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 17288 bytes
SHA-256: 5855616f7c254ac76ec755a8402d36c71c8cd1c0e89c723ac9f60d42b839fe20
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10580 bytes
SHA-256: a466c8abd4502fbe8292cd67e6ab8e8c17c8c63b4deb37a10b5d86833d847e8b
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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