Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f04447bbb7f665b…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 21:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44aa5852aea304cf024c4d5cb5195240 SHA-1: 28ed17a8875212b4ee50ef1e93aca230d889ae61 SHA-256: 4f04447bbb7f665b93286165ca484a8ececce4430ea7411eed63b354ef34b773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://garglob.ru/uplcv?utm_term=best+disc+golf+podcast PDF link annotation
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5e71a278b66fa0130a1caa54d6b21dab/76330378970.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5a07cac76a8af37d9f7a0532fd32e16/14934201435.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r8gtna356vdiq7ofr3n5vmkhba/83423884127.pdfIn PDF document text
    • http://chongros.com/userData/board/file/21332689528.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160920bf01ba32---42354362941.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/649ba019979629a9871e1560a0bee252/pinutixagitavewutusojeb.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sen4m6dtu2fqduu6cjq29ot4p7/zafaliwakegi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d5fa878a3---xijovojijinebene.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/pavolamisuvoz.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dawaradaxasifuwowuzasepo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4ed61cf3cd07bda7b82b81d3a1c3ca25/zuluni.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/94227289618.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qd2ieg5svhn75vcg9e2ncqlu41/57060560448.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/dubune.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xulewetuviwukini.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/26817880354.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/vupososugiripu.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a95b1944ff7ff5a8d65b0c5eb6b160ab/rogiwibifupetuzob.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721468cd56---62931230856.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/53ebf0cfb2ca54313fc4c564b1aed23c/renilumabe.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504171906676653.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf5877d95---31752042248.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9134741e---lofokowidir.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/49056521789.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074f4b714---97162865140.pdfIn PDF document text
    • 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_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 17460 bytes
SHA-256: 970a8f7b484d0b24daa0aac90b3a5aa8e4e009ff67f02eaa859b1337718dc613
font_02_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 10644 bytes
SHA-256: 10e4f4b5c747047eec085ad3caa4d4044b5a5348b522ce18a614ebc4fdeb1a2c