PDF malware analysis — malicious · d678e8c718a3f322

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 11:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 5addac11d0a343c8b61755253a084226 SHA-1: c0b845f2fd5077f79a6165c1efd33e0c2b627237 SHA-256: d678e8c718a3f322ac1f10e779e27bb5a5c85cc64cc9b9d996724a33e748733e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The `utm_term` parameter in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.8243

Heuristics 5

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
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://inwebjor.ru/uplcv?utm_term=invadir+android+na+mesma+rede+wi+fi PDF link annotation
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5fk9d50jhujsp1qnqlsr879cs8/nezim.pdfIn PDF document text
- https://mayxaydungthienlong.com/uploads/files/files/18310554729.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae9807a81d---1258140498.pdfIn PDF document text
- https://lufty.cz/UserFiles/files/71753398334.pdfIn PDF document text
- http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/dedunaroregu.pdfIn PDF document text
- https://lufty.cz/UserFiles/files/6374275364.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30b962dc7---88934847516.pdfIn PDF document text
- http://bkdesign.ee/userfiles/file/59486361828.pdfIn PDF document text
- http://clairvoyantinfotech.com/demo/images/jomavujokofodunepizi.pdfIn PDF document text
- http://lsneotek.com/ckupload/files/punolegonopexuniji.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3db4190fdc8e76aa80e13061ef72daf1/nikozevomuzevonulaxijotok.pdfIn PDF document text
- http://byty-pardubice.eu/UserFiles/File/27553479511.pdfIn PDF document text
- https://solidpractise.com/files/userfiles/file/vinuta.pdfIn PDF document text
- http://dcbestwings.com/uploads/files/bolataxugo.pdfIn PDF document text
- http://gemaeldeundobjekte.de/uploads/files/koxopasodesavejuz.pdfIn PDF document text
- https://agros.net/uploads/file/gepuminitatukefamuwinej.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/1956878166.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///20210923101346_487292857.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/zesarerilujatijuvenigow.pdfIn PDF document text
- https://journalofcritique.com/ckdosyalari/upload/files/norujelufasefore.pdfIn PDF document text
- http://vitalbafitnessclub.eu/userfiles/files/witojajelititego.pdfIn PDF document text
- http://liubeauty.com/luutru/files/satijelen.pdfIn 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_off0000d9a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BB	10472 bytes
SHA-256: `0e2cab813a3216a415a9ffe7ff18f6a7a18731f391ed494823a193321887900f`
`font_02_sfnt_off00010985.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10985	18288 bytes
SHA-256: `bf2503c1fa9f5a98b3217a15a7d7aad7b5b6c11feb27655f571c852e617c4385`

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