PDF malware analysis — malicious · 3e84f3fcffd31d7a

MALICIOUS

PDF

97.6 KB Created: 2021-09-07 22:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 96540e81d0da06988b23da639fc7bf51 SHA-1: 50f5ec796a9a064491cf1bb42359e79ad34a96e9 SHA-256: 3e84f3fcffd31d7a4989538caa33f47c33a7592e4a0a9dcaffb8a81fa43164e8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting domains. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is not informational but rather to host these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9879

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 http://mayjack.com/upload/files/97536319809.pdf In PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e511e6052---88928439089.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bk4ca1vv2l2m9op6sn2rm408uh/tuwugajufuru.pdfIn PDF document text
- http://xn--b1akwe.xn--p1ai/userfiles/file/39326613734.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/51798702288.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee007e6fa5---31965434783.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/sezawimevilapuju.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c83591c1---muvokugejum.pdfIn PDF document text
- https://khambenhxahoi115.com/images/files/roxomadajowusugos.pdfIn PDF document text
- https://dhesient.com/media/mevigimilo.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cpf9r6urtcp2q5b97l1ipv87c4/74244648229.pdfIn PDF document text
- https://jancsoalapitvany.hu/ckfinder/userfiles/files/83765281555.pdfIn PDF document text
- http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/1496529906.pdfIn PDF document text
- http://prinsart.ro/uploads/files/52977443459.pdfIn PDF document text
- http://iucecb.com/files/file/24393117780.pdfIn PDF document text
- https://arbormaster.net/uploads/files/pibedo.pdfIn PDF document text
- https://arendic.cl/files/siwejaxidoj.pdfIn PDF document text
- https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/35856447397.pdfIn PDF document text
- http://www.hon-ro.hu/userfiles/files/gevikiwiwunovefegu.pdfIn PDF document text
- http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/fukufedubinobe.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/2406027220.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ig3u5lsj4t9to67mlav2sjfkib/25992178915.pdfIn PDF document text
- http://szpitalstrzelin.pl/userfiles/files/vagikozodebarawis.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7648c4f7---99755977368.pdfIn PDF document text
- http://anticacarsulaeborzoi.eu/userfiles/files/dinipawixiwozigetaz.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123770490613---vijomatewerupuzol.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/85467763485.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=programme+moyenne+section+2018+pdfPDF link annotation
- 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_off0001135b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1135B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012b6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B6D	19664 bytes
SHA-256: `c0c60eb326276330e885c3b6bed75593e3c8e271cac4d33f0cd76287c4e9ada7`
`font_02_sfnt_off00015d5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15D5C	11536 bytes
SHA-256: `72315e5a7ee4cfe558287c375debf194e4bbe1182b109bb7366d13f717c1b3c6`

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