PDF malware analysis — malicious · a6278b7b5d1c4672

MALICIOUS

PDF

91.7 KB Created: 2021-08-11 12:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 3396d167a089ff3663ad8c2c685fff86 SHA-1: 7db918b63dafdada0e7c2fb12a3ce7075f1be635 SHA-256: a6278b7b5d1c46726a1baea41a3d13831d5fa1c026c5df95410e2023b7efbf95

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier as malicious. It contains numerous external URIs and link farms hosted on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond being a link distribution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=ketosis+diet+food+list+pdf PDF link annotation
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/86bde55bcbdc3c809600893c7f6c77fd/pabewuxigijemoz.pdfIn PDF document text
- http://yonseri.org/userfiles/files/bixonevekuzapum.pdfIn PDF document text
- https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/50832968aa2b292736535011fc0d63b8/21224157956.pdfIn PDF document text
- https://fibaquitaine.fr/cebatrama/userfiles/files/voluvojuvoxenimopu.pdfIn PDF document text
- http://olympiad-bigben.ru/ckfinder/userfiles/files/75087025976.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c12ec052---35620905499.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30da737bb---mokilefodixivojarinoxo.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///4265673973.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed28ac6e9d---7476820890.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/bbp72ouk38h5lonikmdl4u2kq0/74398398211.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6a106e3e8b1ba015f1c59f229639bbd5/wogilexax.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/670sp8v6kpib1uukd0hu3mtleo/31995642369.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd64730d5d9---72187188081.pdfIn PDF document text
- http://alituncer.com/userfiles/file/13614719999.pdfIn PDF document text
- http://yalciniskele.com/imgup/file/robejorulagemuwax.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e8e36e687---maxeleni.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7225cfe19d40722f705bcdde046abeee/teforubemozewizob.pdfIn PDF document text
- http://bjjiffy.com/upload/50984632590.pdfIn PDF document text
- http://morard-mcf.fr/data/Files/15719941243.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/wewib.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e0cc23a6---73214274768.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b6c2b1a8---30323441345.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_off00010334.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10334	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011b4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B4B	10116 bytes
SHA-256: `828350d11322cf659a6829c47702f6a26a9b2f7d54b47f9a92577f52055ffeaa`
`font_02_sfnt_off000131fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131FA	17152 bytes
SHA-256: `c2d177bfb9061e5115b9db295df615d20b060a0693fa91cb4996e5ecc0576a9a`

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