Malicious PDF — malware analysis report

Static analysis result for SHA-256 3677051841907579…

MALICIOUS

PDF

82.5 KB Created: 2021-06-14 03:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87770bfb603f6764244bf8d609d3758f SHA-1: c9fde2cf237540ff5819ed334c93daa714726dde SHA-256: 36770518419075797f6b4535404cad03f7320d8fe38f8f29ae6aa118b9a00c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the presence of external URIs and compromised CMS upload links, pointing towards a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=bad+boy+hollywood+song+mp3+download
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eba303080---lemotulozubepe.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3fb6c525dfd26d160fd2b8573704f871/6268077098.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62a3a2455---21787086407.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f330a4b91---lixituno.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f2e2acd0---98918551036.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa74a64416---suzul.pdf
    • http://phuocthuan.vn/images/pic/file/20854546006.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fc4e2b778d966fbb039f14364eedcc46/21378035325.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8d27d96c8bcb375a5a2fa2acd41f2d49/nulol.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/60f3ca596f8fc783eeb111a028604198/98300559574.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8717c978b---doxesunipawisinifa.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8cbaae132---27233889924.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bcf48edc7ef410f6a46bb07142ad237e/guluwigatofovesodepukeri.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977a199bf4---43660643993.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7f1ae07267d4dbbb92198f50dcff2f6/lijorezapenelunidamabowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4a.bin
47be80e62a673db9d8023eee6d9198635f184c5f2fa0121ca1f089fa8ac8aadf
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 5824 bytes
font_01_sfnt_off0000e110.bin
518dcdddd588988f6cbf697a60d451e4a75708e2f6abcaada25ef27e2524b510
pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 6120 bytes
font_02_sfnt_off0000f4f6.bin
5e0d14662a10fed6640ba6f6ab487f80d8b6743379ac1ec85587926f06235ef8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 12388 bytes
font_03_sfnt_off00011ca9.bin
96ab3042575e6db92b7bad1aac42ed8095504d59665b3326cf7857e97d54a14f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 18776 bytes