Malicious PDF — malware analysis report

Static analysis result for SHA-256 169d78811d3d8f3d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 06:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1cf8f15dc825256cdc9f7f55d941f00 SHA-1: 7d77973b4803119c920b69cacea9a006cdb49fa8 SHA-256: 169d78811d3d8f3d481f896694fdac21d03c3fd53f0298aeece15349d388f852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The presence of JavaScript indicates an intent to execute code, likely to download further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://liniagdanskzydowo.pl/files/48783071565.pdf In PDF document text
    • https://kaplaitalia.it/userfiles/files/21508399055.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d67dbcfb2---498768627.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/23f6747e6c8d6fc69c76359b2f1b8466/fogulapolukedu.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/88097471320.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/c2p3ot6esgvud0e394d90e1nlm/57200738016.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kog7qgbk483448no22rllbe502/farexa.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gujixolipanokolekubo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd4168787d---69195350491.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nuxugodejikijasatoju.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/13364326402.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/waxigodapugakotisub.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/38379333179.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b426918b0---94849515312.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/52796305387.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b908bd49ce9---kidojenalalibarapa.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/21931825481.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/79993994541.pdfIn PDF document text
    • https://khanikango.in/file/24740161615.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xekilujevarat.pdfIn PDF document text
    • https://comfort8889.com/upload/files/11755104828.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb1d1bfd82ab48f1b968faa833e0d68d/83434755557.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/svijbqpvu9ic466f0k986op283/87961621606.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/7322708903.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/velawoposisusirixaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tigrinya+to+amharic+dictionary+pdfPDF 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_off0000bc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 10796 bytes
SHA-256: 3daa9d5b911c3d2ad8f8ee6f63f1809ce128d40107d73e62c802a35bec533436
font_02_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 18032 bytes
SHA-256: d1cefe6927e9fe697742751ee4554512e3c334edb2de1a62b45da0d11dd24c4d