PDF malware analysis — malicious · 0093e4dc9d667f96

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 13:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 85a7007dcbe0a75b8f79300c26cb90ff SHA-1: bfa866c3f3c476d52a2cbcb3273e2ee267faff03 SHA-256: 0093e4dc9d667f9644ff2d06cbf9e89cf0e33534bf63bdd22a614366ac8b1968

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious document, potentially delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=atomic+and+nuclear+physics+pdf PDF link annotation
- http://vertracapital.com/uploads/files/jovewirozadewabiwos.pdfIn PDF document text
- https://sklep-pinokio.pl/web/uploads/files/69599900945.pdfIn PDF document text
- http://monterroso-construpuntos.com/campannas/file/tebanafavawunerek.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f10c7241---93222748672.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137386ba364d---warakogoke.pdfIn PDF document text
- https://luathoanghuy.com/uploads/files/xofasimewuvosawusom.pdfIn PDF document text
- https://mkontroll.hu/File/xenejufosuxelenozenusi.pdfIn PDF document text
- https://pabxlg.com/userfiles/file/numilukaw.pdfIn PDF document text
- http://chemtron-vostok.ru/media/file/lukemebenaxibepibi.pdfIn PDF document text
- http://xedaphcm.com/luutru/files/lapin.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/717fb2e727402a6f662ae63a1560725d/roleba.pdfIn PDF document text
- https://www.rapn.ru/ckfinder/userfiles/files/jufipegewunuvonepulujaf.pdfIn PDF document text
- http://mintaialuminum.com/d/files/68832228696.pdfIn PDF document text
- https://happy-playground.gr/uploads/_uploads/files/guvibuwekefaxumudawu.pdfIn PDF document text
- http://quincy.pl/ckfinder/userfiles/files/93992453438.pdfIn PDF document text
- https://groupburuemas1.com/contents/files/24259100042.pdfIn PDF document text
- http://ayurveda-shiatsu-nice.com/upload/files/fikevoxejanimozesofolin.pdfIn PDF document text
- http://pop-around.com/file_media/file_image/file/10379369780.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c089083b14---pubefemipugomodip.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/dipetosilasajuwewejum.pdfIn PDF document text
- http://nuklearmedizin-amro.de/userfiles/file/jejalutiso.pdfIn PDF document text
- http://majortaylorride.info/images/uploaded/file/96607714546.pdfIn PDF document text
- http://sonnenheizungen.ch/fckeditor/editor/images/file/8790921760.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/66783477913.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08557c9f6---70733382811.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_off0000da8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA8D	11080 bytes
SHA-256: `5fd60d1eb02466fbfebfaf95e41640a34e76a4fc39441af2d124a70e3d3d5e36`
`font_01_sfnt_off0000f438.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF438	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C4A	19772 bytes
SHA-256: `b0a8c62ac2e3f39ae7c3f74b75150019d161d691c89fda7308be029a5d3f88c4`

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