PDF malware analysis — malicious · 501400d49cad917a

MALICIOUS

PDF

81.0 KB Created: 2021-07-03 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d3d9f8bbc4ef9d0c161915a1cf29b14a SHA-1: b4d6dd40707c92f5d738660bd5153f4071530a3e SHA-256: 501400d49cad917afa9176643aa75b9a6ddbb4f863f55d4bb4d66d763e4bf9b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting further malicious PDF files. The primary attack pattern involves directing users to these external resources, likely for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=loose+construction+definition PDF link annotation
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d3a2a42cbb916767deb236e9df43e750/durafurububeruzofilemos.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160781762bd0f5---78007510940.pdfIn PDF document text
- http://poltinka.ru/userfiles/file/duronimexisasunanuliluso.pdfIn PDF document text
- http://i-daa-wl.de/userfiles/dujavima.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6deb98cbef3c45d0f7b202b929a6c438/3314945512.pdfIn PDF document text
- http://umiyawoodworks.com/fckdb/userfiles/file/60267528587.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/709jnk0tojhc29skobre71blvn/8205174662.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06fe4e9d0---fewatuvibulitox.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e6b2da56---rawebenobepewedizi.pdfIn PDF document text
- https://verandapattaya.com/userfiles/files/zaduw.pdfIn PDF document text
- http://sparkpro.lv/content/file/91494275111.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35ea6da24---71017161872.pdfIn PDF document text
- http://mxm-hosting.nl/img/editor/file/gosorovemajupakorapofoto.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/73cfd7928ec512c4185936114f804894/1396840300.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/811bbd55e14339b424cf330e027527a2/jeliwanegi.pdfIn PDF document text
- http://suamayin.biz/userfiles/file/rokoweduzo.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gq22v2udfqah279n00sgqsbat9/38855297534.pdfIn PDF document text
- http://paliukenas.lt/i/File/degomape.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/58520595a5149d3d7cf6064e6ab3f0db/40418165147.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3620ce9a9---37638081784.pdfIn PDF document text
- http://nokianhakkablue.ru/ckfinder/userfiles/files/74886330178.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_off0000dcca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCCA	10320 bytes
SHA-256: `d69a5c1530af5a7716835f622ef497f1f1bba6d8a68f0aa0b03ed7d1f9eca535`
`font_01_sfnt_off0000f42f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C41	16476 bytes
SHA-256: `eb63685dd5c7856d3d37d1727c41d68585ac283c7e5b66a932f22cb6c79a524e`

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