PDF malware analysis — malicious · 6f5e44b4023d3af6

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 8886694099543c589113490c37f7b46e SHA-1: 7c5322834954eead46eb22f0446c2fb0071eb21a SHA-256: 6f5e44b4023d3af6933535e936d9fb1fb1512c0076ed4d217dff75f596a120c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=rock+and+roll+please PDF link annotation
- https://an-professional.ru/img/files/file/vadapawibubim.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0ed61b7282e137b1563470169a5a9fcb/50578691383.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074461a468fb---xesapewiner.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/dunujesotokedirapupejad.pdfIn PDF document text
- http://exclusivelimoservice.com/ckfinder/userfiles/files/82854688576.pdfIn PDF document text
- https://carrieres-pierre.com/userfiles/file/pobires.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc8e48de---81185479640.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67972e2192---24536451614.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786383b0a58---53551742096.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf488eceb9---94583241563.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f02e97f21b3e79b7c5a054be42ecbeff/97776580602.pdfIn PDF document text
- https://menlopark.com/wysiwygfiles/file/47498350812.pdfIn PDF document text
- http://www.hmcpacking.com/uploads/files/morovejofevavuridepixidi.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fa635afa---tegubofeg.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e049280ac8f52b4ee648b754ccc2be91/zajizibonab.pdfIn PDF document text
- https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bqkgg8faidberocfuejkr32mv1/96913128824.pdfIn PDF document text
- https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/30f853182653e805f08229b2caed38a9/bolarumewukumefube.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d0ae3fdbe0d87502ec32a897ef94331/19688378558.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b5a8f782---84653819514.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d0058565---53717318535.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d08befb63e4---mugapagizamedu.pdfIn PDF document text
- https://vicotelecom.vn/static/source/images/file/18346072657.pdfIn PDF document text
- http://washchienluoc.com/upload/file/42354673558.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/likodudovirinuseri.pdfIn PDF document text
- http://pcccphucvinh.com/upload/files/91075703465.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7532f985ddd2a0a0452398f4ae64f2b8/zafefivobaviwe.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f2e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2E4	10456 bytes
SHA-256: `262345f854735b425e5ad9754711d8154b823bd634b9d02e0ff8afd53efbb7d5`
`font_01_sfnt_off00010abd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ABD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122CF	17204 bytes
SHA-256: `84ae98d9d2bb9fbb12ae044f28c351d5f22ab4dade1d3c2376e390a08020f85e`

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