PDF malware analysis — malicious · 80f6bf4e0a334a89

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 01:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b13761061c9ebc1dad2d5ae162b125bc SHA-1: ec0af4705aac9dc22ce17b4cc669d7af0a7832a1 SHA-256: 80f6bf4e0a334a89a694bd91fc14bca43dbeb0ab3f801ee1176d00f4bf2c42da

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, directing users to multiple external websites. Several of these links point to content hosted on compromised WordPress installations, suggesting an attempt to leverage these sites for malicious distribution. The ML classifier strongly indicates malicious intent, and the numerous external links are consistent with a phishing or malware delivery scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=graph+proportional+relationships+worksheets+8th+grade PDF link annotation
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/furgeiauhnnmg5j2brafftdfcd/43334758666.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210826040431618.pdfIn PDF document text
- http://lovelyspa.net/ckfinder/userfiles/files/fobavugoz.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058642cd2e---95170946992.pdfIn PDF document text
- https://air-separation-supplier.com/d/files/poziris.pdfIn PDF document text
- http://woods-china.cn/ci2/userfiles/files/20210811124618.pdfIn PDF document text
- http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105190419185875.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7aidkunvkb4st2p4mf08fchcmg/39845421219.pdfIn PDF document text
- https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d64f8127c3b9082b4157eba79360e2e8/91043715051.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c985a52da---70626322719.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/87eb52f32e568703467ed57f61218b57/kirexejazonovifo.pdfIn PDF document text
- http://kjphotocon.org/data/userfiles/files/gukitixuvinunutenewizag.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210429174336125.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40e0375c9af380b8c44d298d8d7a6ffd/bizama.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d127d7d1---25437518104.pdfIn PDF document text
- https://hoanghaie.com/Images_upload/files/42364433939.pdfIn PDF document text
- http://solamsys.com/userData/board/file/40438592886.pdfIn PDF document text
- http://dawahcity.com/userfiles/file/53756169556.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/48de76b7fcbb74ed6bf835049e31285f/jututexapibiwodorovoxudef.pdfIn PDF document text
- http://bafiti.com/sklep/userfiles/file/44817539329.pdfIn PDF document text
- https://anfauglir.com/images/file/85380625430.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c984b50524---boselinezakuzufinavena.pdfIn PDF document text
- https://theshamrockpublecco.it/file/7570147315.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210630204247526.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_off0000d2cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2CC	18028 bytes
SHA-256: `7d3640627a31d41c333843298d024eec478fe44635bb7563ae105c2333ce0111`
`font_01_sfnt_off00010104.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10104	11096 bytes
SHA-256: `ffc0952563620f4407c6184d2a4794e5bd1ac30dc00b8620e3df0533f0d88349`
`font_02_sfnt_off00011ab7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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