Malicious PDF — malware analysis report

Static analysis result for SHA-256 d291adbb579b8eca…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 08:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db1a87e8af81d1fb56095eca6e3937d9 SHA-1: 99ae1eec3c936a87ea4da6642f3d312dc1411670 SHA-256: d291adbb579b8eca3f15536b24f674033b745a454a4d95053e818308cd9d7c06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f702405728---25432857844.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d610144354---60591340134.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d37dc2b6740ad23506acb1e50a48a0eb/gixazopezozezosolebi.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/20171075514.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76876680011.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/73448956197.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbda0453f13---54884496324.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160905457ba512---7429500801.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607293b085b39---33916456909.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/midajekobukefomezifeba.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/69759577745.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a009d385393b7777c5aa9c2061e98fc1/99210433298.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607682be07963---kazulepuven.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef600cf769---95128295549.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b875b8f0---sonerisa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781b2f5e8c5---70988727543.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdf1a2316---67496936841.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/44683353896c6d855967c88f62f9e5d1/36496279617.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa70ecd02---madaramozixajudir.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lofaf.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ffl2a7krks2oeakofqfehbf4r6/lajaruwixebavezedotexo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2e66749442ae7ed5a9bbcc4e9e1941e8/guregunenobikubukatelot.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/9598726281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+place+to+sell+sports+memorabiliaPDF 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 10624 bytes
SHA-256: 942b560c1b53c3fe1e0f0f807688e9fe96d36dbaea3a92d3d1bcfae41b677d05
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 17160 bytes
SHA-256: 8673197462d42d71c57a6071a0a665a4a553e5c34d223d11424820a53ee63641

Open this report in the interactive analyzer, or submit your own file for analysis.