PDF malware analysis — malicious · 846d05f31b5e7cfd

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 05:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b9838a57bc3413a770cdd2aead84b8a5 SHA-1: 497efd46c3f32fbc0a358f92d72276517f87b692 SHA-256: 846d05f31b5e7cfd491965e91069949c3ab4f5a6dc72a068825632ad79233c13

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, which host other PDF files. These linked PDFs are likely part of a phishing or malware distribution chain, leveraging a link farm to obscure the ultimate malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9939

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce79408e1f---pakigutedo.pdf In PDF document text
- http://telegid.tv/userfiles/files/kidige.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8102498---gavuramuxigebidozizixiv.pdfIn PDF document text
- https://netwindowvn.com/uploads/userfiles/file/50873552308.pdfIn PDF document text
- http://rilta.net/userfiles/files/60689378079.pdfIn PDF document text
- https://thietkewebseo.com/webroot/img/files/vutukasix.pdfIn PDF document text
- https://suprizpin.com/calisma2/files/uploads/gegexadowafazigebupazote.pdfIn PDF document text
- https://esvigo.com/upload/files/fokabulibukiso.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d385c2d2de---69879228550.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/39011352692.pdfIn PDF document text
- http://notariocprietoa.com/notaria/documentos/files/renifupajisemewiro.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210904021212.pdfIn PDF document text
- https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/51939690828.pdfIn PDF document text
- http://jtylek.pl/Upload/file/65617304243.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9eea6a6c2---lolazatimelix.pdfIn PDF document text
- https://riondene.ch/img/uploads/file/lobigit.pdfIn PDF document text
- http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/39598878269.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137026ce2088---63817851907.pdfIn PDF document text
- https://kaparatt.com/images/File/26945356097.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/96007675761.pdfIn PDF document text
- http://dasbluemchen.com/88466640368.pdfIn PDF document text
- http://sireny.net/share/files/45559258033.pdfIn PDF document text
- https://textosolutionslinguistiques.com/upload/editor/file/67056856763.pdfIn PDF document text
- https://booburger.myagenda.cz/pictures/editor/files/fulaxidobut.pdfIn PDF document text
- https://daaeportrett.no/upload/file/24978365073.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hamari+adhuri+kahani+full+movie+download+hd+1080pPDF link annotation
- http://pro.ovh.net/~tribuene/images/banque/file/69023644432.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_off0000bd19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD19	11216 bytes
SHA-256: `4a4c78ade4325c120517c9b3ee054d4fd2683d6392f49f8a205379447290896d`
`font_01_sfnt_off0000d727.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD727	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ef39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF39	16716 bytes
SHA-256: `f245052aa1aeaaae18caf0976ce734ebe88e72c0167996c78346bd743921110b`

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