PDF malware analysis — malicious · 45a261c752fc5901

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 20:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f7dca69248d77af575a0b2a6769a6670 SHA-1: 826cb202b5e72b235f082200a22001d2f2e98901 SHA-256: 45a261c752fc5901af7ac9547eda353401c01e1987fbf61775a31987773270f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload directories suggests a coordinated effort to distribute malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1cc1c809a4707c1bfcc5497f1b45e08b/kuwil.pdf In PDF document text
- https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608acce98bdbb---99129304711.pdfIn PDF document text
- http://www.ferm-matic.fr/upload/file/jinuvure.pdfIn PDF document text
- http://adirondackseafood.com/ckfinder/userfiles/files/6576279718.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/10799225569.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ecd073e019106d0ff8fe1b23b296ba6f/ralibitafobefup.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/eos5mi2pp4r36kq9f5mdi424pd/pokejibolen.pdfIn PDF document text
- http://bacvietexpress.com/upload/userfiles/files/65871162104.pdfIn PDF document text
- http://racecross.com/upload/edito_fckeditor/file/53155088314.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e033e8aa---70439221841.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb6e552d53---42051885842.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/62df11e3eaf1df32ca3ce6b385f82c9d/rawagefetebopupodovobefu.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080964df1df5---mujoburisub.pdfIn PDF document text
- http://www.toptehnik.si/images/31994204190.pdfIn PDF document text
- http://area100impianti.it/userfiles/files/tatojuluwekutep.pdfIn PDF document text
- http://vstarmp.cn/upload/files/20210710_105838.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/50786e82a7a4e592a6cd74c423b16918/lizulosigiburujujol.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/melededinimojidinowepiv.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///7878431570.pdfIn PDF document text
- https://groupunsur4.com/contents//files/kujesaxelotakusaxukuvin.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bd00277a4777bf3654022cefaef79981/dejefakibikexezaf.pdfIn PDF document text
- https://binarbaidrealestate.com/public_html/userfiles/file/75216000136.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccbd7319b7---43431505194.pdfIn PDF document text
- http://krakowska98.com/zdjecia/fck/file/josiw.pdfIn PDF document text
- http://mh-gartengestaltung.de/userfiles/file/74065388904.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arrl+ham+radio+license+manual+4th+edition+pdfPDF 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_off0000d7dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eff4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF4	11044 bytes
SHA-256: `3dd41d1101d7e254f7a99894d60ad1702f061643868146d3b904c2903332b750`
`font_02_sfnt_off0001097d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1097D	17560 bytes
SHA-256: `67b20a4a2ac365804c7f3bc187809433922ea48b41c2620236a843bd3f4acd7a`

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