PDF malware analysis — malicious · f35cb054a82f9e08

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 17:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 825a1e910731855624bc9e59f22af036 SHA-1: e3740a2f0e7506ea3cb1f9d8ec8cd5441501160f SHA-256: f35cb054a82f9e08c5c796f0182157abbb70ed71ba198ba86e3fa50842476765

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024963b3ff---45310750645.pdf In PDF document text
- https://alyosserspneed.com/userfiles/files/dexumam.pdfIn PDF document text
- https://cfbadalona.net/ckdata/files/63947956128.pdfIn PDF document text
- https://un7un9b3rl1pa7-99.com/contents/files/9936023992.pdfIn PDF document text
- https://autopsrus.com/ckfinder/userfiles/files/88954555254.pdfIn PDF document text
- http://www.ags-sib.ru/ckfinder/userfiles/files/wolozazabuzubebezu.pdfIn PDF document text
- http://bellina.pl/userfiles/file/21255568413.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c18c06db0---13284945745.pdfIn PDF document text
- https://xn--interpeas-r6a.es/upload/files/rijisuwuvezagireni.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c0c2bf9a.pdfIn PDF document text
- https://dwitunggaljaya.com/sitefiles/file/5950367343.pdfIn PDF document text
- http://balbu.hu/uploads/news/file/38190401250.pdfIn PDF document text
- http://albarossa.jp/js/upload/files/wijiduvunemoxemijizibula.pdfIn PDF document text
- http://thietbiantoanttk.com/uploads/files/60177131006.pdfIn PDF document text
- http://velapower.com/glwh/UploadFile/file/2021091408064973499.pdfIn PDF document text
- http://cobmedia.hu/include/rexin.pdfIn PDF document text
- https://mehreganimaging.com/images/upload/files/64969732485.pdfIn PDF document text
- http://thebankcardservice.com/uploads/files/16966735309.pdfIn PDF document text
- http://shanghaicruiseparty.com/uploads/file/rirabefaf.pdfIn PDF document text
- https://darkoyunpin.com/calisma2/files/uploads/83788886861.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b63fce7dcfc1575f8f2308a2fda2c74/68420294939.pdfIn PDF document text
- https://www.ojchamber.com/ckfinder/userfiles/files/18030972391.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/gekijuromotafemonu.pdfIn PDF document text
- http://wonderpanel.com/app/webroot/img/file/7809903709.pdfIn PDF document text
- http://s2ipower.com/survey/userfiles/files/40375466468.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+was+venice+constructedPDF 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_off0000e2f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2F8	10560 bytes
SHA-256: `069e864843a6604d07e4e010d8b45eb2df223b62b9227bf191c7c43fadff8f2b`
`font_01_sfnt_off0000fb39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB39	17788 bytes
SHA-256: `5653eaa838cca7f52a6747e92371d9fe8c64a1574ea8b59a942667f2e07c6e0f`
`font_02_sfnt_off00012986.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12986	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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