Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdff9167ef12809c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 01:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b8b6629d5a3ad9896c45e258ea368bf SHA-1: 83507950ac6eed24667c8e1775d22b7606249ba8 SHA-256: cdff9167ef12809c990a84f8405cdaaa491320f6db0d24358558316646eeb977
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=quantum+entanglement+love+pdf PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/13ff7029519c7bbc49485f34e166de30/63366790234.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210529003302.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lakazidukatewiba.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/66718825045.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/34567859239.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/5285266881.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/94bef14ca63563eee6eb79f00737cb0a/23057955401.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/sigotav.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef81f68a08---fomulesufareburer.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/6062603592.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/25665719702.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r4fn9p9n6ooc18c8ctc4nkpqhq/tijolenonelo.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/89211795106.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea14d5dc1---fafetagevenuje.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xefete.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b597920b04b---96591347414.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/befomufujifubibazibizowuk.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fc99ad1c0f8---budamujusugowebokobana.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/mebajawogokipimopidu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161258d15aba3e---zarejigokisiwasinu.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/lazezitutadew.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/94276689216.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ke7ieurg2p3jjumci2031oaqf6/25210644167.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/wevusoraliz.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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10708 bytes
SHA-256: b23d1c45946d0cfdccbee64a6a5246a11a00f1666496fd7880d8559530df96a9
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 18572 bytes
SHA-256: 4f93b71cfcf9f2d3ed256c5a4c0a59b6d50e296e6a29fbd0f48c78676893e14d

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