PDF malware analysis — malicious · d6d8289552042a9a

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 05:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c620acb069eb6d876b404033b8c7305d SHA-1: 9ac346f2eadfc7e44ff84a4c097a67e9b8c8f0e4 SHA-256: d6d8289552042a9a9dd7e6f2f937629b26546151c0eac3226a7d82c0bdac54dc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary URL identified is https://synerhu.ru/uplcv?utm_term=acceptance+is+the+answer+big+book+pdf, which likely serves as a lure or initial point of contact for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=acceptance+is+the+answer+big+book+pdf PDF link annotation
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/i0rc6shf7lvku21s3bilv5964l/52915233482.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/temigimiviv.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdeb6522f4---wofofevewurawan.pdfIn PDF document text
- http://okvin.org/userfiles/file/vazapagubuwexatabu.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/rkr95av9utjp9rv9o7cfgkarrg/dipupo.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e6ce582799ff36a3e23120ead6bc007c/wozopat.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/koxejezedimogivofalobovak.pdfIn PDF document text
- http://jinwoosmc.com/userfiles/file/zumifasorenixekivudube.pdfIn PDF document text
- http://dnepropress.net/files/file/46204670100.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/78375104120.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b645eb2ec---zavorofisuzulu.pdfIn PDF document text
- http://konyanincigkoftecisi.com/userfiles/file/46839052731.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vafiwutofifanejinixebim.pdfIn PDF document text
- http://karimeh.com/public/userfiles/file/balamimubukutizazaj.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5951ff7eb8fcd3e44f30cff67b079094/94304942843.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e494ba190da---64649189290.pdfIn PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/78395202533.pdfIn PDF document text
- https://xn--hjrnskadeakademien-mtb.se/userfiles/file/gipifewobowix.pdfIn PDF document text
- https://gilboamedia.com/userfiles/file/nawuso.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/048d61b301db72fcf05df45a6f01345a/bofusakivuteziwajomoso.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/28446cff41684beb85603ce991e03a98/92929571595.pdfIn PDF document text
- https://picinterior.com/ckfinder/userfiles/files/kutelogifitewususiwu.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b0c4e594---masiledopabopomolosogos.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/16f94e054b7d79bc0f4e8cc5e6a5c44e/59039768859.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ptcii9a144otouui05pqdudq31/85998666228.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/68659297629.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_off0000ddd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5E6	17252 bytes
SHA-256: `8ad09718f862eceba42cd09407335a4b9f8e51a97ccdf1e5b4c9343b207bf7b7`
`font_02_sfnt_off000122bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BB	11152 bytes
SHA-256: `7d71d224cf4eed03027b1a21160e3b0a80721719d74eac6ead5265a7fa65af17`

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