PDF malware analysis — malicious · b8a047f0141687dd

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 16:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0b03ad1ac31f41de159894884cad36ca SHA-1: a8fdfcd47875086ceefce6ac28f86637e7a2d564 SHA-256: b8a047f0141687ddcc7cbea1db15cbab47063949b9b0bfb3137f08234c8a46ff

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links suggests an attempt to distribute malware or phish users. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

Heuristics 5

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://olguanaokulu.com/upload/file/lugudagul.pdf In PDF document text
- https://samowar.me/userfiles/files/44173224210.pdfIn PDF document text
- http://racecross.com/upload/edito_fckeditor/file/jaxisininemuf.pdfIn PDF document text
- http://thaihotelsale.com/FileData/ckfinder/files/20210804_46C8669C1CC67227.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c0973f48---17854911955.pdfIn PDF document text
- https://universal4shipping.net/userfiles/file/pegodapovol.pdfIn PDF document text
- https://at1-turbo-j3t.com/contents//files/bogewuwifutuz.pdfIn PDF document text
- http://ctmmaximoravenna.com/ckfinder/userfiles/files/7310065797.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/65984106440.pdfIn PDF document text
- http://studiocastigli.eu/userfiles/files/sekujatojonaberi.pdfIn PDF document text
- http://geteffective.biz/uploadfiles/file/molafe.pdfIn PDF document text
- http://kondicionery-domodedovo.ru/upload_picture/file/nixevefuve.pdfIn PDF document text
- http://debnine.net/UserFiles/File/kibizadokubabipebis.pdfIn PDF document text
- http://owv-sad.de/userfiles/files/5557392345.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a258d1d45ab8cfb0e86c8288bdf3706c/wamafavofafo.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a95b9bf5468f1f43e0840555f3a5c83/zanutidirinezalelebadun.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8bc9ae2890ec2ff6b46cb17da22591bf/kimowapetubitadegit.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d276294d7---regegifumajima.pdfIn PDF document text
- http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/60546559884.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f344439eeb212b8da5941320fdf9a21b/69509742873.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/6920774294.pdfIn PDF document text
- http://diamond6ranch.com/userfiles/file/jokimedotizazunekodekoten.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50043332463.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/83986727370.pdfIn PDF document text
- http://digitalpolicycouncil.com/imagenes/file/90462281274.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f20ffd1ea04---66821780966.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=learn+spanish+past+tensePDF 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_off0000f32d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010b44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B44	10140 bytes
SHA-256: `5b035baf67046da1a77aaf69ede9133077201c8a84698a0dd1262d997ded4145`
`font_02_sfnt_off000121d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D3	17984 bytes
SHA-256: `b25ca1a181b82d57819b75d81a5cfa8c1219a171a53ce976caf195e286309c5f`

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