Malicious PDF — malware analysis report

Static analysis result for SHA-256 c020692dc5734f51…

MALICIOUS

PDF

94.1 KB Created: 2021-06-08 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78ffc07eb49dd13dda7956ec43fe9d4a SHA-1: ed15b535b02872ba76361f1a79d42b3fc1c0ca25 SHA-256: c020692dc5734f515520258205e5201f53341b581c195b8a9214ef38b659cc20
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely intended to redirect users to malicious websites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link distribution pattern.

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://wastran.ru/uplcv?utm_term=calorimetry+pogil+key
    • http://biosite.ru/images/news/file/31202448651.pdf
    • https://cplastik.cz/data/cms/file/pinuwusoma.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/346b8c0aeb11fe1c947958a74e3dcb7d/23609508403.pdf
    • http://anhbanglaw.com/userfiles/file/51117602785.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0u5jtj4mf4rga70sav0ahls42/jugoxaketivodi.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d06956354---69226342608.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090221849a9c---69829191684.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a31f7fb6d0cc1ffe4b366fcd81ca8645/9659988884.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094668750e3e---52236479567.pdf
    • http://okulsanmalatya.com/imgup/file/wolapomo.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba690492937---mugemoduxotebevosugip.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b771c08cdb---jisuropevaluvidinorezek.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e6d64ba3---wanokufi.pdf
    • https://luyenthitoeic.info/userfiles/file/vulorol.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bc0924b9---sipawiwejurelarowovisu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9468a790---1149623592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124a3.bin
1d645eaf2cb258e2c898d06a9540950a226812ceaf3e97a0a7715f028382fb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 5032 bytes
font_01_sfnt_off000135ba.bin
312fc0f62767955e008c33e66b5c14791f325a06fb43c84e72698bdc3d631b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 11260 bytes
font_02_sfnt_off00015c2c.bin
a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2C 16080 bytes

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