PDF malware analysis — malicious · 85d8fa395995cfaa

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 07:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: 78abb5bfcc39339e43a1c01a49de8540 SHA-1: 4407b221853be9e8366c602cb9a501eb22a8ccb7 SHA-256: 85d8fa395995cfaab65578783e9153bd5e2c74f3f277d9ba0ab2d1d8213453e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated effort to obscure the final destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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=tightness+in+stomach+area PDF link annotation
- http://1night2day.com/ckupload/files/jazegafinejomulixate.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607929e37ceb5---19131239958.pdfIn PDF document text
- http://colorfulmedia.de/fotki/fotki/file/60246903257.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609424d626715---ruwofukunofofikamolexe.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f57f9dce1009acab0ecb34cdfc89c81b/wowumanugikox.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1d972d05---zuxerodotasesidezebuno.pdfIn PDF document text
- https://nepalimodelagency.com/userfiles/file/3984403881.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9963671f---95678745795.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5108ccbaa---papoxuwuxopafipune.pdfIn PDF document text
- http://beveragesgs.com/userfiles/file/70009618375.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cd43621---80466547676.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/2202068441.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/931ff4150dafe0393b07935035fb96fd/xanulowotupe.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/jegufewi.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ec480d70f1b03d0bd7918d54bffecbd4/nerurawokeresonuxarewot.pdfIn PDF document text
- http://divorce-difficile.fr/userfiles/file/joliburotidigimo.pdfIn PDF document text
- https://thaihoanghung.com/upload/files/10340453576.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e406e48889---ruwesosojudulakavuli.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/c2hhvvim9f6oufrp88rfv4ip6o/vowoxatoni.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c186a3c6d2---refuriwobajotuzewod.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/552fb2a35903732858e1987b70712a6f/sitakivagumazapipusigik.pdfIn PDF document text
- https://laetitiabernard.fr/images/file/vogezot.pdfIn PDF document text
- http://acupunctuuryao.nl/ckfinder/userfiles/files/sowani.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/13474689870.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae66002b7---94900837751.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_off0000fd0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD0F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011526.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11526	10592 bytes
SHA-256: `ad87bbae777f1354f92498b4319d9a76062326280c665aed0d06e605ae85e3bb`
`font_02_sfnt_off00012d2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D2A	16488 bytes
SHA-256: `5eb59fde3d853c5989948fcf16a2024828e62220f9212b9e63e13c1aa89fdd54`

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