PDF malware analysis — malicious · 05724f9a70dd0f26

MALICIOUS

PDF

87.4 KB Created: 2021-08-21 03:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 88ef252f701eacc28aa9bf0669a5e07f SHA-1: 60b318180d07df40d3fd55d5ca518413a35b0da7 SHA-256: 05724f9a70dd0f26d5b13075c10463eafe38875f091959cdecac37a7a37d0f4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9807

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://archism.ru/uplcv?utm_term=fisica+general+hector+perez+montiel+6ta+edicion+pdf+2018 PDF link annotation
- https://shoppingplanet.ro/ckfinder/userfiles/files/dekukusizimo.pdfIn PDF document text
- https://hgb.se/filer/file/disudixuruzositagan.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8652149e0cb86f3691bb2101ab1ebd65/nobazoxitebowixoxefunu.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccacf90029---jubutemorigiz.pdfIn PDF document text
- https://beatmuellerfoto.ch/userfiles/files/senanidefekexaruxalan.pdfIn PDF document text
- http://tourister.kr/userfiles/file/pedosit.pdfIn PDF document text
- http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/74387992384.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610324130a79a---43988869129.pdfIn PDF document text
- https://apz-arte.com/ckfinder/userfiles/files/49471015340.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e06640c48547bbbf6c0ea8e0a1716f4b/84896465843.pdfIn PDF document text
- http://munsusa.org/userfiles/file/20210628033137.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c9c1354d---woxapomat.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b8ae61e95ec8ab1c4c96b964d11a6387/59683651685.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/06/06/file/20210606_095230_136.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2f2d5f2a993ea337f8a82fa2060b71ba/xofoxo.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609177d839dec---90287209319.pdfIn PDF document text
- http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1982538827.pdfIn PDF document text
- http://sanmorales.es/userfiles/files/20285488776.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/48nqrqc8dk7a60ub75e29v05i0/38297271144.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8b18a54cd---34499469210.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2l00bvv4ndp4djus4a02c0j1p7/59773834502.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ig4b8uof5lareqikl8795k6m0e/77291571692.pdfIn PDF document text
- http://bptramptour.pl/files/file/2317189264.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/5974824175.pdfIn PDF document text
- http://hyperasp.net/userfiles/file/rukipoforizorire.pdfIn PDF document text
- https://projetounificado.com/uploads/files/63511365032.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d79f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD79F	17964 bytes
SHA-256: `ba57dd120298d9c6c92bdf6e034aa21494a092424e1829ad0ffe889ce3904a2d`
`font_01_sfnt_off0001053b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1053B	11772 bytes
SHA-256: `3d2eb9ca78e19af11daabc543327b434183816816f50b4b0c16fb1ee4b4ffb9d`
`font_02_sfnt_off0001210d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1210D	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_03_sfnt_off00013689.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13689	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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