PDF malware analysis — malicious · 05da0249d31e1543

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 12:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7980951594e12611ddf1a4b6eae15026 SHA-1: 79d0812aef59f24ff081bdf5f78af08997b7424d SHA-256: 05da0249d31e15432ab9ca6bab36e0d2b06f87afd579be4947ba0ee92f3a26e5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to phishing or malware distribution sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or credential theft.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=best+buy+ps5 PDF link annotation
- https://www.privathospitaletkollund.com/ckfinder/userfiles/files/56938790977.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2557ba9b9---muwimunuzigepigilaxo.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b278cb96a36a17d82cd9d229c393dc7c/vofunet.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f01c3013---govaweroleponaw.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8440f03fa1624e44ab56b383e3fc34b4/zitaxojadixoramoba.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b209a92c20e---11349459822.pdfIn PDF document text
- https://rubfila.in/files/file/95835668254.pdfIn PDF document text
- https://ancoraeducacion.com/images/15817098728.pdfIn PDF document text
- https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/mibibebuzonesimaz.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160799cd195277---wivetofixekemesadok.pdfIn PDF document text
- https://aicpwdosaeast.com/ckfinder/userfiles/files/54270476302.pdfIn PDF document text
- http://zamokugrofa.sk/admin/fckeditor/file/9573223880.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/26dcb0a80241a5b6dc954c20c8bd2810/benisitabozufefanazutasi.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9g9vlr7acrkhs1p21nte9se2hn/30572287360.pdfIn PDF document text
- https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/bigufajaviga.pdfIn PDF document text
- http://yoron.net/up/files/wifuvumudojujuv.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608697d6ccf6b---13703791346.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160711986081a9---98344101451.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/teu0ibrh7c8ea0ibdj3manid4q/jeruresemujokozomoxazule.pdfIn PDF document text
- https://mepho.hu/ckfinder/userfiles/files/72430750772.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f27528d74a26560ca09b8607a58db139/4816700038.pdfIn PDF document text
- http://chelseafoodmart.com/uploads/files/todabekupipore.pdfIn PDF document text
- http://firmen-bekleidung.at/userfiles/file/dulawilixiri.pdfIn PDF document text
- https://jokerprod.net/userfiles/file/48712507575.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_off0000e405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE405	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC17	16976 bytes
SHA-256: `577c5fa2aad8564dfbc8ba3745a91e8d2b4611bb75586a225450b06bc7f3ac75`
`font_02_sfnt_off0001286b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1286B	10160 bytes
SHA-256: `224c0e56cc6dbefa81c87fe998588f796fe3533fd23d5e5b15082d95ae6e4a60`

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