Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fd70e38da6ea07…

MALICIOUS

PDF

75.0 KB Created: 2021-08-05 05:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eedaf915165eb1b09c945400b0a4ff01 SHA-1: b83e816bf31f51adb204f83e6e0c415d0e004024 SHA-256: a3fd70e38da6ea077895631d95ba65645f3f226b0e12125c0804dbc256e08768
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5266

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://adasms.fr/userfiles/file/zarevak.pdf In PDF document text
    • http://roocenter.ru/upload/file/zunixusuwirulimukabazo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/boguxagitelomewaran.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1bslqcs348dso57395m0ep509p/61841958311.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1e547696---64645988841.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2dqvsg7asc3ads1v07i4t41np8/vulojeri.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/7292435164.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/31514186411.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/de783f8087e5813c6e236437aa7e488a/55645351090.pdfIn PDF document text
    • http://agro-partner.com/Image/files/rasexudim.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f016e2aa4c---xunapizoveloxubuvib.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7e6291b6---65415790188.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd066349a12---57912730111.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/02507342c17d1c90dce7fcabafaeeceb/donewilo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/sigofabimatibiwiwuriwu.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/67203066108.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/6ffe20ec552a13917305088111118c74/tememupenotop.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ac2fdbebf9c6d7b83b05e902e03c9a8b/81705287898.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/79124120040.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adab9d60f00---gasomekis.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fd0512da181bd55af6383954e2ce74d7/15353851462.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/jivotinalupinovukutesav.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/foxameremazo.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/63594930350.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f51da2e3e35---zuvafivatifurabozelojen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=o+lar+das+criaturas+peculiares+onlinePDF link annotation
    • 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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 10632 bytes
SHA-256: b1685fbc4e7479161881c8757836f49118cabb968f780273471e77c0c65c9e5d
font_02_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 18616 bytes
SHA-256: 97fefa0199373b2bec3e726f62c3ffddf15a47519133bcee314756fa5ae5497d

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