PDF malware analysis — malicious · c37f6cc8353b0311

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 10:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: bc44a66a11f472032d7311aad2bbd0f1 SHA-1: c4f75827e7de2de3941258e823a1e8b2f1832c5e SHA-256: c37f6cc8353b0311de7a02f3b6adef848a525de7871a9a448f22a575a4115086

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised content management systems or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of link farm heuristics suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution point towards a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=handbook+on+computational+intelligence+pdf PDF link annotation
- http://harlit.com/upfiles/file/porezuzoduvirawujewegok.pdfIn PDF document text
- http://hublihorse.com/uploads/userfiles/files/35315594431.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084641f9be61---16536736756.pdfIn PDF document text
- http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/manetiruvedagakiminori.pdfIn PDF document text
- http://arniestribu.com/campannas/file/28149198856.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/65831773764.pdfIn PDF document text
- https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/58085951946.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/63c5e26cb9a0d486f7a4feb32e899b61/dufeveze.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/99019382254.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-07-28/2107280831175623688la3ugzp6kgv.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9be106ff---49873611970.pdfIn PDF document text
- http://ei-windykacja.pl/upload/file/xexoz.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1ff7c805e3b634194e0c5bb45f7ec546/41803273210.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/752b57114b105dc19d188bbedf584259/77178559381.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8a87a019d7389c1c6147cfdfb30f5e01/nixoxidufabaju.pdfIn PDF document text
- https://zmiz.hr/userfiles/file/35186206810.pdfIn PDF document text
- http://chinalabware.net/d/files/67687468376.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/dab55b3aa7f73db6ee823e3959cc7de8/duxugunomova.pdfIn PDF document text
- http://alliance-ic.ru/uploads/file/96772108734.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223ea3f808---1965121109.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/35811551483.pdfIn PDF document text
- http://landpas.pl/upload/file/tejemelulazukidigebik.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/lre3rins8ctqirvb5dn83q2lre/90163503918.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b959a7a1---14889253992.pdfIn PDF document text
- http://goldenpeak.it/userfiles/files/dujikukej.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_off0000f5b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B3	18952 bytes
SHA-256: `9bdf077025f30a0f3f8148d8984bc74e548e5ac29ac9e24f0950d4c2a28e5355`
`font_01_sfnt_off00012724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12724	11016 bytes
SHA-256: `b131a8bc8c02f3373fab995e7edde89f2532343e436f67fe309cfd865308628e`
`font_02_sfnt_off00014036.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14036	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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