PDF malware analysis — malicious · d4ae8582bbdc3e2d

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 05:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: fc36a8b7faa905b2af39de9d8b91aa98 SHA-1: 4b63f4c70d279e51e33ebaebc1aff34b06b6dba2 SHA-256: d4ae8582bbdc3e2d12ab31e143081307acfc57ca5327bda34cb88ee70c37a1d9

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method to bypass security scans. ClamAV detection and ML classification confirm its malicious nature, likely a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://oniceh.ru/uplcv?utm_term=como+resetear+un+celular+android+bloqueado PDF link annotation
- http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
- http://highdeal.linkeo.net/ckfinder/userfiles/files/mebuvulenivokuwoxok.pdfIn PDF document text
- http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/59450387022.pdfIn PDF document text
- http://aristosaigonhotel.vn/uploads/files/72829904139.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff88ca1d03---37845474748.pdfIn PDF document text
- http://chickendaylacrescenta.com/uploads/files/85160271008.pdfIn PDF document text
- https://thegmsbihta.in/userfiles/file/bizogifinure.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/98497698012.pdfIn PDF document text
- https://afayl.com/userfiles/file/wokasemudebado.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614013ed16903---8777157070.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/dotomuzapanawa.pdfIn PDF document text
- https://best-of-geldanlagen.de/userfiles/file/tokukidajekatog.pdfIn PDF document text
- https://forumsevens.com/images/file/raxipisugapudevi.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9bd402b71f894c34d4d943df680a42b7/deximuv.pdfIn PDF document text
- http://fskyok.com/uploadfile/files/jitewifi.pdfIn PDF document text
- http://constantemail.com/userfiles/file/1631796799toperabugazumatoziro.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/51101658359.pdfIn PDF document text
- https://szabolcsipeter.com/userfiles/file/73555342192.pdfIn PDF document text
- https://get-insurance.in/ckfinder/userfiles/files/tumozowubudevudivexawem.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142702290f8c---9246879925.pdfIn PDF document text
- http://auto-rad.pl/userfiles/file/vaxopesogumepuwejobup.pdfIn PDF document text
- https://hgb.se/filer/file/suwopikajemidajugodelanim.pdfIn PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/velezibijux.pdfIn PDF document text
- https://piauiaqui.com/ckfinder/files/robezerazujakupagaja.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_off0000c5e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5E2	17952 bytes
SHA-256: `a31d9153af755756c6c71ad083baafd7877193ad61f5781d5e74fcfe94972a2e`
`font_01_sfnt_off0000f369.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF369	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B80	10948 bytes
SHA-256: `62ced55afad095044092ae0de170bd6eb2f8aed30b3c4a0d2348a5eeab51642d`

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