PDF malware analysis — malicious · ff1f707f75bdebe1

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 20:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9d73623427f78a5e0554ba6e5bb0a677 SHA-1: e53f4a637835c9829a402523858244b141c57e0c SHA-256: ff1f707f75bdebe136bf27399dd340a353022b7b1114e725456748123d67a4d1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/pedofalufusewolinajobaw.pdf In PDF document text
- http://spreewaldatelier.de/img/editor/file/25300463379.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0351c8b9b---74673797492.pdfIn PDF document text
- https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8655a0b776c17af55a93b60bba4cdcda/migef.pdfIn PDF document text
- https://rheinfurth.de/userfiles/file/zuwen.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0d1bf5403f85f8afa6c2322520eac7b1/68984288015.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/07d03b71e8726434f5b6485eec549a43/nizokimujaminuf.pdfIn PDF document text
- http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/1187798970.pdfIn PDF document text
- http://rzn-house.ru/upload/file/53053419147.pdfIn PDF document text
- http://maremio.ru/admin/ckfinder/userfiles/files/96543388147.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/modu5q3f5sn956qhajam4tr3lj/fosuzujukivupaxuvilux.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e68bb5f6---baxifoz.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2o1aceudllii963pppusk4tonb/75040969124.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jqfvagsn2henakrj2uk0m0i307/fiduwamubaxad.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a5ded13be96d22a7e5dc5829d3053dca/64350953578.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d544300405f---tavutonasitejizesuxonalom.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003f1d7be3---zogabopazapava.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b734f3e82---81621801962.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mkj1bi24nn5hr05u16q2e8jkme/59798806006.pdfIn PDF document text
- http://gapoom.com/upload/fckeditor/file/61709097394.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1245c3092d579611dc12add22ac26271/kijobas.pdfIn PDF document text
- https://www.institutvzdelavani.cz/files/pimivif.pdfIn PDF document text
- http://shopexpert.com/app/webroot/files/userfiles/files/wulujeb.pdfIn PDF document text
- https://clubkdo.fr/img/pics/files/kaguwuvutesa.pdfIn PDF document text
- http://jingluo.net/uploadfiles/files/85662263092.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c128e4784f---31364943413.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bd665dc7---jasuvuzezofumugoriwofe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=personnel+policies+pdfPDF 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_off0000d6f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6F8	15844 bytes
SHA-256: `92ce90dcfc2615e5aacf3a49e310c752068055d6009e02759a1c6a9bcebfccad`
`font_01_sfnt_off0000ff25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001173c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1173C	10356 bytes
SHA-256: `d2e6bf77159ac3e20080cd1e4de1b16fef7a10bae7a7f2969c917479740edab1`

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