PDF malware analysis — malicious · 3c5f5d410b464705

MALICIOUS

PDF

82.6 KB Created: 2021-08-16 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d9a98cd357b52791ab20f652f89fa233 SHA-1: 79cfd7f73165736aedb19a95a43c643a03f63019 SHA-256: 3c5f5d410b4647058b24465c2376907031564f413183fc192cb7e1fa193321c0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a likely SEO poisoning or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports this assessment. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

Heuristics 5

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://crewmak.ru/uplcv?utm_term=m+sikirica+stehiometrija+pdf PDF link annotation
- https://aldurra.ly/images-editeur/img/file/dibujuzakiritonereroru.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6bd6a2cdabbabef983447b2915b5ab13/zofon.pdfIn PDF document text
- http://pritchardreunion.com/clients/81409/File/64453083780.pdfIn PDF document text
- http://vinhthuan.com/upload/files/86881054317.pdfIn PDF document text
- https://nabijdefossa.nl/upload/files/2829728509.pdfIn PDF document text
- https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/b31a6a32a74bbee3cbd30ad4c484b1ff/26492180672.pdfIn PDF document text
- http://hi-techfiber.com/userfiles/file/69988306592.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cafdc30f8f03bc6158c26b0a6e371d3f/dixegexekefodapuzikomo.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e432772459ed2b8647afef1c21ffc258/fiwazimokibafetegujad.pdfIn PDF document text
- http://jainfarms.com/uploads/999839526.pdfIn PDF document text
- http://noithatdangcap.vn/app/webroot/uploads/files/24473661310.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/167fabc2dfce34d4ab1666a226f7188a/18237623476.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a3118df418aa23fdfad2535189d96e99/tesuxiluteralovekojudiron.pdfIn PDF document text
- http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/35088968912.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/62255787634.pdfIn PDF document text
- http://geose.ru/userfiles/file/fafododasukoj.pdfIn PDF document text
- http://esthebel.de/userfiles/file/wagodilodetezufidemaved.pdfIn PDF document text
- http://verkaufs-akademie.com/userfiles/file/33367837313.pdfIn PDF document text
- https://digitaldaya.com/imagenes/file/xokoropadabupiwo.pdfIn PDF document text
- https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/77db5f8758ef48f9515f581f3885b304/pepatagakitix.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc6f62ebf---fogutukebigedaneg.pdfIn PDF document text
- http://www.peretprod.ro/content-images/file/592525085.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s3hck8aii1so1h227o294g9ok4/456018321.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/bavovelukinazejurefarar.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_off0000d7a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7A2	10952 bytes
SHA-256: `9317268d78b37d4812acd89a4775e5e5408a46f2b17f5f16cdaeaa626013adf1`
`font_01_sfnt_off0000f10e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF10E	18988 bytes
SHA-256: `7f1f032e2bbbd61bfeb4d78e6d385cd6aeb0127a19d0cf5e7542ad15c36eef52`
`font_02_sfnt_off0001222a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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