PDF malware analysis — malicious · 8b65ebd96d4149cf

MALICIOUS

PDF

88.9 KB Created: 2021-08-11 03:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3d7d2a3e043985ed27fd7ccf103f3487 SHA-1: 26051f5987e291f4f8fc27c0599b7468896bcf75 SHA-256: 8b65ebd96d4149cf964051fd65b6642d6612c8c8b21bd8242684d7f3eb2d337c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 6

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.
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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1g0eth7acfi3cjvngr5ph6jj80/98913146626.pdf In PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/56b30636c96b8c38f7f9f41516d70ea7/nugasinefiwasenozim.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88a636e41106631fa3051c8e730753a8/68050728866.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd98eab429---nakumugugovolugepafuni.pdfIn PDF document text
- https://alutat.com/data/file/xejoxexivofabonigekabed.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/rijosokogenuwudikasulek.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/1949565344.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/02753cc935435ad4c9eb45e0d495e047/zazuxuwotap.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2634c20e64---38738571299.pdfIn PDF document text
- http://pivotal-technologies.com/userfiles/file/jiruxiv.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/bre393ct3ahd1e40s00oqf680k/kizeku.pdfIn PDF document text
- https://journeywithmypet.com/ckfinder/userfiles/files/79161562612.pdfIn PDF document text
- http://duonglaohanoi.com/userfiles/file/8000808234.pdfIn PDF document text
- http://ventilatoryzlin.cz/images/file/64583068300.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6312add6---jenopogajexesefisurej.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/da75954f14836b6a6df1bd9cb6a41a1e/99316382969.pdfIn PDF document text
- https://thuaphatlaihoanghuy.com/uploads/files/zagoni.pdfIn PDF document text
- http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/92798547347.pdfIn PDF document text
- https://roweryelectra.pl/app/webroot/uploads/file/16245423918251.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/127d22272961f94204253d4f2174d5f8/65112848130.pdfIn PDF document text
- https://unique-u.biz/images/uploads/file/pijuwitidimawinubefax.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204793d2f8---86857932425.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e16943d23---78164925852.pdfIn PDF document text
- https://kodcomputers.ro/2664/uploads/49255392224.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/668243858cae81335c046295d7ff6cf7/71894946321.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/709d36be00a5b7c1b272e2a9d1391986/90558908086.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=friv+old+menuPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC19	10124 bytes
SHA-256: `e290e45151aa50a1d8387e86c8b9622faf5a4b74a7afb6944f3844c4ffd0a1f9`
`font_01_sfnt_off00011291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11291	16688 bytes
SHA-256: `f9e86c18ab3c4e2f5a051b396ead8388c161223cb9fbc7b24e01b7a7b7bc9d5e`
`font_02_sfnt_off00013dd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DD9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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