PDF malware analysis — malicious · 338d5f6623b48474

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 08:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: da9b8b53045ed5d54d8cd985fbee5019 SHA-1: e600b90be026b6ec0671a4be9352638df8783508 SHA-256: 338d5f6623b48474efcdfbadef72ad0f902877cfa1e45efad5cf50170a854af8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute further content or manipulate search engine results. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution or SEO poisoning campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=fungal+infection+in+icu+pdf PDF link annotation
- http://kd-council.com/upfile/files/gonarigegaxevimexafuguwap.pdfIn PDF document text
- http://basaritarim.net/admin/editor_resim/file/tisugosazajetinuxaridawo.pdfIn PDF document text
- http://maisondequartierdespareuses.com/userfiles/file/45996654891.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/tuximekukudaxup.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/890329897e927c465c94404058fc7ce2/99180783604.pdfIn PDF document text
- http://niestachow.pl/data/aktualnosci_imgs/file/vasanajigezaguwo.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb5211ecc---91833936141.pdfIn PDF document text
- http://aktifithalat.com/resimlerfiles/37381168495.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c1e5fe2c---dobutajolugidova.pdfIn PDF document text
- http://zamel2.pl/userfiles/file/8365101755.pdfIn PDF document text
- https://vieclamday.com/userfiles/file/694908237.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088763cc81f8---35056292610.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb5d388e4---narun.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607534bd74d1a---26627237001.pdfIn PDF document text
- http://chistogood.ru/admin/ckfinder/userfiles/files/kiredixuxo.pdfIn PDF document text
- http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/fexedemibe.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/86e612918831971540138f5fec4c7274/befudimikotanatokodu.pdfIn PDF document text
- https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ea82528e---vemivilerepideve.pdfIn PDF document text
- https://parfumzone.ro/files/file/pewis.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/sakevuzibebofuj.pdfIn PDF document text
- http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/49237371148.pdfIn PDF document text
- https://bedandbreakfastchia.it/userfiles/file/torebofavumaguzip.pdfIn PDF document text
- https://crpm.ch/ck/ckfinder/userfiles/files/57713252033.pdfIn PDF document text
- http://terralis.eu/catalogue_dynamique/file/xalezikufe.pdfIn PDF document text
- http://hightopeducation.com/cms_uploaded/file/mevekazinagepufi.pdfIn PDF document text
- https://sieuthimaytinhcu.vn/upload/files/23179497146.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_off0000fadd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFADD	10604 bytes
SHA-256: `a7f6a769a95c2c561ef608ab47bda5a6a4a0ab2f5119837dece0b97c39b95629`
`font_01_sfnt_off000112f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112F6	18028 bytes
SHA-256: `8c4d324bd9117f0aad27642b51017ed850b7bf90bd9e9e3b5a746fef062d821d`
`font_02_sfnt_off000141fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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