PDF malware analysis — malicious · 5902dd22d94d138f

MALICIOUS

PDF

78.0 KB Created: 2021-09-25 10:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5d811d9ae6525eb7667799fe0592bac6 SHA-1: 39d844f6f98b6de827053687f833af987704f859 SHA-256: 5902dd22d94d138f86375d4eab1e83f2ca8c65423aaa22221bb671ea4dcb8511

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall pattern of hosting numerous external links is indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9788

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://synerhu.ru/uplcv?utm_term=the+panda%27s+thumb+pdf PDF link annotation
- https://mimpishiodua.com/contents/files/55532171999.pdfIn PDF document text
- http://esangsok.com/upfile/files/12173609934.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/muakjlfoejf9jalhf5gi1ivf9j/nixunapejepuji.pdfIn PDF document text
- http://pensjonatagat.pl/userfiles/file/23951012342.pdfIn PDF document text
- http://jullien38.com/ressource/site-image/files/29881399710.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90d1220a3---53983124436.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeea99e62---71976151315.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4c290bc6ef8f6b580e8ed15242deeb6f/44059454464.pdfIn PDF document text
- http://aroma-es.red/yamituki-n/uploads/files/tujabekarexijurok.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/poxetolezutugaroren.pdfIn PDF document text
- http://ibrahimalsada.com/pics/file/reguwabema.pdfIn PDF document text
- http://www.sm.ac.th/ckfinder/userfiles/files/zovikifuwo.pdfIn PDF document text
- http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_015240.pdfIn PDF document text
- http://reichspfarrer.sk/file/32409122791.pdfIn PDF document text
- http://hodori247.com/uploads/files/zufedofi.pdfIn PDF document text
- http://chayka-svg.ru/files/merixelelubugi.pdfIn PDF document text
- http://rockpapersun.com/upload_mce_image/file/vuwofetakepafavuxifofibu.pdfIn PDF document text
- http://riverside-plaza.com/upload/userfile/files/rapenekabupivinilaziziwir.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc3eba6e---71358793725.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614880bc9f7a2---67371235575.pdfIn PDF document text
- https://detector-billetes.com/Imagenes/file/lazazasek.pdfIn PDF document text
- https://rosanaalvarracin.com/userfiles/file/gesekedikigomonuvikexebak.pdfIn PDF document text
- https://saikekanglun.com/filespath/files/20210914100223.pdfIn PDF document text
- http://geonatlife.es/ckfinder/userfiles/files/61526423397.pdfIn PDF document text
- https://tsegypt.com/file/29405034923.pdfIn PDF document text
- http://kredoteka.ru/uploads/file/zatosu.pdfIn PDF document text
- http://studiostocchi.eu/userfiles/files/88499839711.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b7c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7C8	10644 bytes
SHA-256: `6d641bbd6afe7dff1663aca8c5e03c4ffe485c6d889233025a24e39ff30a6693`
`font_01_sfnt_off0000cfcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFCB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e7dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7DC	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`
`font_03_sfnt_off0000fdb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDB1	16904 bytes
SHA-256: `7ba21073ee70093f2851d2ca1893cd7e6ea1d6cb6ce276f312481d861a73f5ee`

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