Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3d76bbbc081efa…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 13:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b488304cecff441fbfddca6251f7e9d0 SHA-1: 599949cae653188ffe183ecbaa47f3acaa299ef1 SHA-256: 6a3d76bbbc081efa25b8f3fe4199deefa1308c412a5dba0db520a0c556ea15af
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/32541f00f586840b6aebe7a081299945/97184979199.pdf In PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/50024036617.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160763fe5ab6e7---69399264714.pdfIn PDF document text
    • http://renovator.cz/files/file/firutedubevafijej.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/putasokovojazuxuvew.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160781ce11fe7f---rasudupulamiwetunemomo.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/zubidaleregojixi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kikojulejaxebuli.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/votulijidu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce081ca6ae8---20347286061.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609084f624305---36620555290.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/35993208311.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/71479807629.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846979e1280---63787599078.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/27304877204.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e5d60df37d01d279f131d1620c9968b1/vilalavunisuropimexiwa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a1b5b0d6a87ccd1cf97b8475eaabf42/17267787335.pdfIn PDF document text
    • http://tms-operation.com/upload/files/71700470862.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/096e5b52ff026c1f7db21ccbcd136f7a/45954654765.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088fcc158b9e---46643115360.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/16fa4cde0a29bf62220c50b4a049c233/97164254162.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfc3aa3f53e---vevozomapufosuge.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/33d315b7a881e78ae6e128eb6020d099/59018711105.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/7502417866.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607920767f713---56422301620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+2xp+tokens+modern+warfarePDF 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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 16984 bytes
SHA-256: af3a1009a0856a0f52154fd642306e920b6363eab80380174df8d83359687592
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 11092 bytes
SHA-256: a03c2a16af0ae30b12d2d74e882cfdea5b40ccc08a2a082a6858c83469842471