PDF malware analysis — malicious · a9c4b6465a48de70

MALICIOUS

PDF

92.0 KB Created: 2021-07-13 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 21bf8f68ced7cda6bda7f64895ee9ee3 SHA-1: e6f155d85aac37530124af1773a7ec7e2f5e49ae SHA-256: a9c4b6465a48de709045e6c8eeaafd975e46b1d85bda371aecae29b0d07ad89d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bp063ofhffrlbc4j0qk9ckq0s/rederutixuku.pdf In PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/645ba13174f3606f64b02b67486f8b41/32075075647.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba2eeac25---85128902334.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c9cc4146b0577a53123f7c128ad70191/bufefi.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5f4b9ecfe5b3f4a1e030f2a4c00599a8/zetimuwepaf.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9b08ae10---62181929579.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02aec5e7aa---fegeminifizotidid.pdfIn PDF document text
- https://shop-ecobati.com/medias/upload/files/4249188147.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/32888879691.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/30126327449.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-5/file/nosenefev.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/47af75b7a612a4c6e783b1b2fd4a762a/58484516808.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806725286b2---zakelisulazobetivapaf.pdfIn PDF document text
- http://zonwering-nederland.com/ckfinder/userfiles/files/78138537605.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a294ca67744be2c817826907366b6588/23671811371.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/33650294654.pdfIn PDF document text
- https://digitaldaya.com/imagenes/file/41330492695.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/23676447911.pdfIn PDF document text
- http://quiltingacademy.info/fckeditor/userfiles/file/tilusujud.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/jagezi.pdfIn PDF document text
- http://illinoislivestock.org/userfiles/file/7254354506.pdfIn PDF document text
- http://eco-versute.com/app/webroot/ckfinder/userfiles/files/48006676490.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pto19q94a2i0rpgmbbqrcc1md0/39911708581.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b0695c56---vunatizabuzefibuparuz.pdfIn PDF document text
- https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/4339927068.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=direct+and+inverse+variation+class+8+worksheets+icsePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB04	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_01_sfnt_off0001007f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1007F	17944 bytes
SHA-256: `c75e6c24e67ff0a0bb63d57febbf5bb33703fdd5aca78e181e43199b9abcd709`
`font_02_sfnt_off00012fee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FEE	10920 bytes
SHA-256: `fd7d64bf9519f582ecb62fa9f23ebcb5ac984ecc6787a4d49c8eda44684c8131`
`font_03_sfnt_off00014940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14940	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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