PDF malware analysis — malicious · 1efbad471d2d1fba

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 18:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5aa5fa12763c4e60e9cb502492412a5d SHA-1: a7d8fef0b044341b6d985637e7aa7e5530e2e3f5 SHA-256: 1efbad471d2d1fba9cd4c89728f298e337a156f0e6c6c38caeaba08341c65b0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link-based attack pattern.

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbaa550ea---7160561602.pdf In PDF document text
- http://www.w.radeton.cz/ckfinder/userfiles/files/wagumozavetobenezijenu.pdfIn PDF document text
- http://virtualcharityevents.com/vce_cake/files/files/71722615392.pdfIn PDF document text
- http://lohoithaiduong.com/uploads/files/nesute.pdfIn PDF document text
- https://selapro.com.au/application/third_party/ckfinder/userfiles/files/lepamiwezoxo.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bcbb8cda95598508cf988a3207b752e9/nuzijukiwojazogodulubun.pdfIn PDF document text
- http://angelescare.com/userfiles/file/mijanenezeli.pdfIn PDF document text
- https://cargobull.cz/res/file/14220602366.pdfIn PDF document text
- http://www.dereformasenalicante.com/archivos/files/nupubu.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44203bb4598900d805086f81907e9f62/vozomonapag.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4eec5a7f---25834746560.pdfIn PDF document text
- https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/70b564dc4d5d49f5b5a49d100103e77e/45216563384.pdfIn PDF document text
- https://nocnepal.org.np/ckfinder/userfiles/files/xewusuvugomowozejarite.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b054e1d8936---poretekajupizunivimute.pdfIn PDF document text
- http://dreiseengrundschule.de/files/78495475932.pdfIn PDF document text
- http://latexindia.com/userfiles/file/danolamunujodugotifuf.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e939d528c---seguriduragedifefopekawi.pdfIn PDF document text
- https://cremyco.com/app/webroot/docs/file/65343226023.pdfIn PDF document text
- http://bluecreator.biz/ckfinder/userfiles/files/9988467157.pdfIn PDF document text
- http://skyline1968.com/clients/74864/File/gebatazimoratajatoliki.pdfIn PDF document text
- https://taxfirma.com/userfiles/file/pajijekobazorevuvul.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/eeff647144275ab07314fb5c36f36f47/54711982351.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/792cc19ff8946196f9cd77c403c904d8/tibixamedonodizajomabi.pdfIn PDF document text
- https://www.stock2morrow.com/ckfinder/userfiles/files/58602188172.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dc907f3bd8cdabde19decf781772bab9/69916556716.pdfIn PDF document text
- http://www.mezmat.ru/ckfinder/userfiles/files/24992239481.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+thirteen+british+colonies+worksheet+answersPDF link annotation
- 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_off0000c33a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC33A	15512 bytes
SHA-256: `a9a74851e0a906d2eb29345d16a8fd86dea144ea6af23db5a5d371241c754d2d`
`font_01_sfnt_off0000eb15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB15	10608 bytes
SHA-256: `e1497bca11bbefa53cd3faceb1ed5ac73a0a380e67bc8ae872bee673fa665d83`
`font_02_sfnt_off0001035d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1035D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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