PDF malware analysis — malicious · 1525b456f8ff6bb4

MALICIOUS

PDF

113.3 KB Created: 2021-08-07 23:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07

MD5: 574bb57fb96803427bc1bed6d976a461 SHA-1: b7a611db3967bf3d415f4cfe9447182ce7cb3c5e SHA-256: 1525b456f8ff6bb4d5dd51065aeb7bb0afca99023aaba186dfcdc0ee9a1d2ab4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9863

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://inwebjor.ru/uplcv?utm_term=is+hearts+of+iron+4+multiplayer PDF link annotation
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942870e4879---80615782426.pdfIn PDF document text
- https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2f6c1abe---vulovibefadivanazel.pdfIn PDF document text
- https://alutat.com/data/file/vipoxugasekitefatomabuseg.pdfIn PDF document text
- http://altiro.nl/home/tjerk/file/45849710395.pdfIn PDF document text
- http://goref.ru/files/file/palitasutemiwezuzawof.pdfIn PDF document text
- http://blevy.com/ckfinder/userfiles/files/pojajiligonexewadikibewa.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1e42c5257e81594b3fbdcc3dc94a03e8/26570860547.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79a2f193a---28053095394.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dff0c36ac---97011771265.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3eugi6lccf929bg1mskb0cl255/27512019007.pdfIn PDF document text
- http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/pofovolil.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/58540183003.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3081b0b---bejolirabujifovaginumenaw.pdfIn PDF document text
- https://pharmalogindia.in/ckfinder/userfiles/files/6448812183.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/760d865a92920a5fb08d8d1f3cd16680/54229199047.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d53b35f5---pijupi.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/foxetiwobibimadejexozisaw.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb060a3187b---53726584822.pdfIn PDF document text
- http://piemonteforyou.it/userfiles/file/lokemoxitok.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082ae1aec6---4017513159.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fec5dcdd4efd287b14c2ee1dbb5ddb15/83009965791.pdfIn PDF document text
- https://vasantviharproperties.com/userfiles/file/64647905876.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/97m517d6mu7tdcgt17bin55cnl/5318763612.pdfIn PDF document text
- http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/defulemuvapalokemagejawu.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/xagogigogazujedaxetix.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/632d74df03eea8d54c5c1276bf4d5644/39465046677.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/316dd018bc54ba3d647311ef65c3a0a8/ramexegobawatel.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_off000156d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x156D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00016ee7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16EE7	17916 bytes
SHA-256: `2364c3b6a8db3061ea4e58a70c1d63b8dead142189f3d6a2951b8cd7a5ac5edc`
`font_02_sfnt_off00019e2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19E2D	10864 bytes
SHA-256: `0f0f5d8e463bb2d748ed6565b7b6e0ff9c3da7cd09e97816c3b8a75d34a9a9fd`

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