Malicious PDF — malware analysis report

Static analysis result for SHA-256 7327f9101f507d1a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 22:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddc2cf5ec1b1aee1726a556484eea98d SHA-1: 1700d1e5bfa021f61363d6143c8bc292bfdfc5d2 SHA-256: 7327f9101f507d1a44d082b70d9d1dbed2c5329ec5ee75d08f74f08aacd662ca
164 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 delivering malicious content. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely to download further payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4483c00ea2---xivifuredefipegefu.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0e365c795c58cc1c540f119ec35b8553/zekofopetenukalejopubu.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/38096898008.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/71743995332.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/18612659378.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/45938579401.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1e4a4fee14622a85c25b1cb3975840fa/peterebekovogujutalono.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/24629800278.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/82548783846.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160765cb74cae9---pafetimivipojegi.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/wibawiviwabujo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16208473107365.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/55975958191.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vejaposotamewamuvosif.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/11999614193.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/54325678986.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/bepevomutukuwoj.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/riijq12miltth6ak90td1osrbr/buvukedujiluzaruwulel.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/05d005667458a18cadaabb824e1faefc/29164440182.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fivinawofudesurelo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7df417e1ff---24991047216.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/munudi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/30f31f96fffb4dcc725a47b0b002c77d/649150548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cloudy+skies+astronomyPDF 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17644 bytes
SHA-256: 56d77e5be1c323c99102bee2caaaf6ca0708adf060e1aa57eb6ad1d49ac8fe0e
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 10744 bytes
SHA-256: 58c113eb9cef00fecc00d7c5501df6102cd42ad041939f53cbf8b53258014a0e

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