PDF malware analysis — malicious · af731c1d12fc8f06

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 21:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 0d78626bbfdfe37f21ded7f0822c7f6f SHA-1: 0b5a98e3bc3320a54a568353df9d641c9badaffb SHA-256: af731c1d12fc8f0606085393e815eb6d93ce2074a02cb0d165e38f095e1835e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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 http://elsekmont.eu/userfiles/file/28405007586.pdf In PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7a67caf1132e3448c46578b1e38e5549/vizaladuworobuke.pdfIn PDF document text
- http://anhuicrew.com/upload_fck/file/2021-5-15/20210515025208494931.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s52fgfi8upo50os7bkptvo9ns0/75056046751.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8e0862ba8---63419616353.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5069a8729---didaram.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e224d3cf71e---turewoxu.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e21c4f0c64---gexepugofa.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/as41efc85ojvdu803fvdcbbug7/10389411802.pdfIn PDF document text
- http://vietthanhstone.com/images/news/file/zozikolukurixubapu.pdfIn PDF document text
- http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b12c88229---62245290534.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb4a4e2f5---jupifojosixe.pdfIn PDF document text
- http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964f9f1f026---81703993398.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9bd1aec6---56643002734.pdfIn PDF document text
- https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/a164972c9ed2966f5b7423e80153ee75/39539588057.pdfIn PDF document text
- https://ms01bet.net/contents//files/19107690565.pdfIn PDF document text
- https://ruiguoex.com/upfile/files/2021/07/16/36469955147.pdfIn PDF document text
- https://i3mit.com/shopadmin/upload/files/gizezo.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea0666cb---nagibusezotemafisobevutuf.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4a5c32cd0---7672002643.pdfIn PDF document text
- https://kmkmekanik.com/upload/ckfinder/files/89468402905.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5espbkr63q3c04ludr5j6fc6h1/76849967554.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06feb0675c---77907077218.pdfIn PDF document text
- http://garderoba.sk/images/_file/wigukep.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210507111046_1932437367.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=onde+assistir+libertadores+palmeirasPDF 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_off0000f6b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6B0	19024 bytes
SHA-256: `c8866d9cf3ce88c4caedf2d825c7997b45ed3e86df14b5769b286bfa57c9fc89`
`font_01_sfnt_off0001256a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1256A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D81	10720 bytes
SHA-256: `f69cabc72eb42f40ab0515984711a126399b2304c8204b779f549820902123a6`

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