Malicious PDF — malware analysis report

Static analysis result for SHA-256 12945e3759def714…

MALICIOUS

PDF

86.6 KB Created: 2021-08-15 09:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5aa6c05d6434ac139c43b640a26fcf85 SHA-1: b889829924e4eb3476f41e660e87a0a601439d79 SHA-256: 12945e3759def7145325f5f5e314930eaa16a98b16d6e34c82dd6d63d3f0420d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://donovaly-ubytovanie-safran.sk/web/userfiles/file/55017622343.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/15434894480.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9466872a---nakokumabuvulemapixevapas.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/snupo4pcqv1l9msmbfgm7dsoi5/46537593833.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/27469087036.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/207b5b6d1bd295de89ae11fae40d76c7/fufadit.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eb0fc38a4d---ditusimidenuwi.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/99909444374.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/089eaec7d60d337a9645fd186e1aedd7/xubogetegemijizuvoxiba.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5760a5b1ab---41943153382.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03530058f671cd27c7601ad11d1462b8/88638651829.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/30654247409.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa18e4aae---14735275603.pdfIn PDF document text
    • http://placc.info/up_image/48330333023.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5735be23---46316806909.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/niseginikunopuf.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b06f18506---84688982455.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c638b1923120c555b792baa5523e9054/35107641597.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/71933882318.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53dad411d0---tiduzanitokuxepa.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/bafepobevetogus.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/40761705549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ngu+idle+jake+setPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/mazosezopofuteritikiluto.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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16932 bytes
SHA-256: 3ba468c18137d84192c9df532084b091441c42a3be54da1b16d803e9ab69d03f
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 10400 bytes
SHA-256: 25ce531134ab633f000d883b41927a7c7274da6319a336ce7da9c67cbc9009da

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