PDF malware analysis — malicious · bf7531d6e3e4ab9e

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 03:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: edd9309aa36465bd3f84820c2966ea47 SHA-1: 03585eb44130a41fa946a5d67abd0c64453d789f SHA-256: bf7531d6e3e4ab9ea9cd05cb728395222e573c5e4be8e05d83637220c892f9f6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous URLs that redirect to various external websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were extracted, the ML classifier strongly suggests malicious intent, likely to distribute malware or facilitate phishing through these redirects.

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 http://farmaciacogliate.it/userfiles/files/detujakiwa.pdf In PDF document text
- https://hglobaltourb2c.com/FileData/ckfinder/files/20210628_59F0572417C7F8E1.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-7-25/20210725021158509131.pdfIn PDF document text
- http://palami.by/images/file/juvobeb.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dc892b5eb3ccfdac17c0d83f77d817b6/gumexiruposato.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ada7f2ccd7e32dd2474c9448144fc6a/57999980586.pdfIn PDF document text
- https://alarrabnews.com/images/content/content/file/28181112583.pdfIn PDF document text
- http://cityclick.it/userfiles/files/18845607476.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/kudunenesenib.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18e9b5528---24016405533.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/mibapemilogonuwurot.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3255f443cdcd44a934d5500f15786898/makosibe.pdfIn PDF document text
- https://albawadiroad.com/userfiles/files/godurirug.pdfIn PDF document text
- https://uclerbaklava.com/resources/file/71685198387.pdfIn PDF document text
- https://yuss.it/file/jirisawigepewofe.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b456ff52---79393295307.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081043b16029---84204633611.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7847a84a3c---3209199391.pdfIn PDF document text
- https://ortechindustries.ca/ci/userfiles/files/11596224138.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/earcd7gct862g51usq2u25uceu/kevenapejolo.pdfIn PDF document text
- http://klick-tipp.info/ckfinder/userfiles/publics/files/68844927588.pdfIn PDF document text
- http://land89.com/ckupload/files/ditodijevefipu.pdfIn PDF document text
- http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/140890395.pdfIn PDF document text
- http://burfel.ru/upfiles/files/1011016156.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=full+term+baby+meansPDF 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_off0000dff4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFF4	10388 bytes
SHA-256: `c95f85573e5d16ae4ff1fd8aca8a0e450a2850618a16265cd9ba070e7ef626d2`
`font_01_sfnt_off0000f77c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF77C	17028 bytes
SHA-256: `24b569aab142e5f583edf6a4faa7c01c25759748a739f9956067ca281bb8eb79`
`font_02_sfnt_off000123d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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