PDF malware analysis — malicious · 612b2ee4d6c338a4

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 00:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f19516b9816e8c372afc0e7a86f9d044 SHA-1: 079de9d3f6208a9a72ea91bf008bf49597c550c5 SHA-256: 612b2ee4d6c338a43e41395577bdeecf6ff0bad15768a7b16217e0ea08ed9460

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards exploitation or redirection tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://medvor.ru/uplcv?utm_term=come+cambiare+versione+android+su+tablet PDF link annotation
- http://vetportonaccio.it/userfiles/files/sununijofuvozisukipapo.pdfIn PDF document text
- https://spitalmoldovanoua.ro/ckfinder/userfiles/files/zewulugam.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/2334974326.pdfIn PDF document text
- http://rapet.hu/files/tivuta.pdfIn PDF document text
- http://gro-felix.si/uploads/73445560269.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/tepatufu.pdfIn PDF document text
- http://www.dean-cpa.com/files/adminpic/file/29341950039.pdfIn PDF document text
- http://erpos.sk/data/files/girezukoxedonetugesi.pdfIn PDF document text
- http://stluciachamber.org/uploadedImages/contentImg/file/5206452720.pdfIn PDF document text
- http://iuoooo.com/filespath/files/20210919125955.pdfIn PDF document text
- https://redengewinnt.com/userfiles/file/1957694648.pdfIn PDF document text
- http://vladjurnalist.ru/archive/file/wufeperarakijuwak.pdfIn PDF document text
- http://fotocaroli.it/userfiles/files/75478278606.pdfIn PDF document text
- http://fueandhair.com/userfiles/files/67217187842.pdfIn PDF document text
- https://ipekyolumedya.com/resim_galeri/file/88038148713.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a90c5b6c---7545819577.pdfIn PDF document text
- https://vantainoidia.vn/ci/userfiles/files/86555251744.pdfIn PDF document text
- https://santechnikosdarbai.lt/images/files/34425036850.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409aed117c7---44044894571.pdfIn PDF document text
- https://mb-classic-service.de/userfiles/file/xatubex.pdfIn PDF document text
- http://www.asiacoservice.com/file/files/xenikilagabujupilagogi.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ab501d96---sakulogapudolaf.pdfIn PDF document text
- https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tolabosuzabu.pdfIn PDF document text
- http://incomsistema.ru/ckfinder/userfiles/files/kafinabemutategevofug.pdfIn PDF document text
- http://evola.it/userfiles/files/92576849769.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6103e875---zurekikitilix.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_off0000b34c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB34C	10868 bytes
SHA-256: `6a5bcab09eba1c0bbaf28d71ecc709df2769fa443ff463d89e75cfdb772a4b7a`
`font_01_sfnt_off0000cc70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC70	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e482.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE482	17064 bytes
SHA-256: `a6aeeabd446cb8c99cb408bcf85d1d4a9ae9829b2926bd0da17192e5be27e647`

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