PDF malware analysis — malicious · 4ee661f9589775a1

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 02:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a7ae3b3bb88dcf9a724b57c778d03002 SHA-1: 2e3d66d559c96ca72641004dd62b83f65a92e473 SHA-256: 4ee661f9589775a1f7f305eab977a4e133b66a0d61c403da6a94e55243bfe579

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=rudri+path+lyrics+pdf PDF link annotation
- http://envigest.cz/upload/file/lejepidapitolovosuzif.pdfIn PDF document text
- http://ahdjcm.com/upload/files/kuguvipupet.pdfIn PDF document text
- http://epoch-making.jp/js/upload/files/13269944633.pdfIn PDF document text
- http://uptownchantilly.com/uploads/files/15678161377.pdfIn PDF document text
- http://reicar.dk/userfiles/file/kufejo.pdfIn PDF document text
- https://mariellatriolo.it/public/file/xigesizezixokik.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86bdfd83f6---guwowalatimofukiwosojadet.pdfIn PDF document text
- http://chieucoingason.vn/files/92198448216.pdfIn PDF document text
- http://seanmore.com/userData/board/file/memubikakijek.pdfIn PDF document text
- https://sukhayurveda.in/userfiles/file/napasewujipuwi.pdfIn PDF document text
- http://go-pxl.com/uploads/files/nelepavotoke.pdfIn PDF document text
- https://okazionche.com/files/folifoxabakidurigelu.pdfIn PDF document text
- https://flexi-cms.com/uploads/file/jotisaseda.pdfIn PDF document text
- https://totounited.com/contents/files/79605878099.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/4888904437.pdfIn PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/kukuxemusufagesimixefu.pdfIn PDF document text
- http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62772522486.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/18f379ac188750b34275663da37d2d16/96632529546.pdfIn PDF document text
- https://partnermind.cz/images/files/wevovimepawe.pdfIn PDF document text
- http://uniquecharacters.com/upload/files/rinab.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4cdeb7ad1---ropagatediloba.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/93739fadcc123584620d8f29d64b4ba1/magagodadawe.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f37ff6d8049c65663463a49503fc984e/polidobukujirulozokumi.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/36938550e1ec4138e53f5158fd4b8589/19656336752.pdfIn PDF document text
- https://vaitinhdien.com/app/webroot/upload/files/juxasiwudaxojidimozetinu.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_off0000cc1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC1D	20072 bytes
SHA-256: `df06aaea882c4df49c5c1c233d36d599b9da9b258a19760415b52184bd53d21a`
`font_01_sfnt_off00010144.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10144	10620 bytes
SHA-256: `8a03573947a3a2ea1730fda62e75fcbe39e9fe4d39033802785d8d28c57b7a8c`
`font_02_sfnt_off000119b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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