Malicious PDF — malware analysis report

Static analysis result for SHA-256 d730cd2a10e577c8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-31 10:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5898b46d513c1faa333b1966cf51be0 SHA-1: 86bebbae92eae4b4f36392548b58af4e885d36e0 SHA-256: d730cd2a10e577c89bc43626c43e8c9baf168952937d0ce2876f2910bcee90e5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised or disposable hosting domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and URL distribution suggest a malicious document designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://a2designbg.com/userfiles/file/32653068389.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h3rnjhisf1cvurmmrc0gl4afr5/ponupasezibazugegu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xanafererulasuz.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a6b41ef961f399505fd56af3702c511f/tajibukarepa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610478fbcab25---binitovaxoxasulimilopeki.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/o6l2qnsmkv6jko9nsslavpa9m6/borarofubajip.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6eb185e04---24699007837.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/lexiratomosobor.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/rokipetop.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1813fc22dtbg4lj8sqf9hu2982/55937624095.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/zanagolojifo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd25d08a4---25690625836.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xoviwodejinoteleg.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xatolupajesugiforig.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813c2ee2cae---43178402498.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5080164b40---wavewuxerekibojejupijeb.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb088334---xidevisebe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae0c5c3ac---ligifobebevilu.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/10495746241.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/59384906520.pdfIn PDF document text
    • https://aedwea.com/upload/foto/petakobomabo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/62468653c43737e78f8a74c7825ee7bf/dawakezukudakemupez.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/dagajopipab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+a+halfords+smart+battery+charger+plusPDF 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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 19352 bytes
SHA-256: 2cc8bd4608ad4c6ec05dddada679db86fae67618a3963c251eecc1322d51502c
font_01_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 11300 bytes
SHA-256: 9f68c16c40977e345126427f5908d988fd7078466f4fa7427979877a5564a3f1
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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