PDF malware analysis — malicious · 66ec83543e2f3716

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 00:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5f93625ab04721b177caddf05eca90c8 SHA-1: c0c64c09902dd2eff621e52a12c04158f27c1463 SHA-256: 66ec83543e2f3716b7c42fdc511c49c5d74e356cd11a6c201b91d4d0cbcba7f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafc778116---wupelonebe.pdf In PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b7b8b8b7---sazokubeji.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46178eaa3---nawurojulomovazapute.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/25586e7791879ab9f9526217b4cfd89a/wedagufabilawaputukopola.pdfIn PDF document text
- https://cpsguffanti.com/uploads/file/63208498573.pdfIn PDF document text
- https://davaocarrental.com/images/file/pisigononopibijepitu.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b34d84036---fedofumabefekowemol.pdfIn PDF document text
- https://tlproduct.com/userfiles/file/saneziwigixamawotokewuti.pdfIn PDF document text
- https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/856532ae5e08a26473ef5acd1ea0c452/41902847968.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00e7e70f8---48894550759.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2eed4d7631e68c66a971c1e8dbcfc518/novemevujixijunim.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e1d0d616---bogazibepelazegegebawoloj.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bd24091d3340647b5d3083b439172bda/fanag.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/od166tltful7vaultrjbh4p8tl/99979263880.pdfIn PDF document text
- http://robertfeinberglaw.com/images/edit_images/file/tixopiwete.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d559c57e92f---35947541151.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/porilorebon.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8bcd15e3f90b7d1d61c136ed87b7932b/38474022056.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3706c69d99---3261153051.pdfIn PDF document text
- http://abwlanham.com/uploads/files/96214070211.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2b8ea31afeebeb6ba727e4664088adb1/40305377987.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc89bef7c3---2279942816.pdfIn PDF document text
- http://alltechsro.cz/files/61201699419.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448829c5a8---7437785280.pdfIn PDF document text
- http://crm333.com/documentos/file/wujagafukowimuji.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/fozodapuropolazodus.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=largest+music+streaming+servicesPDF 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_off0000ef5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF5F	17652 bytes
SHA-256: `90907fa00f1a9ef37bfc7d09803562c83796793919d4dea6371dd419b1ba3db9`
`font_01_sfnt_off00011e2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013646.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13646	10528 bytes
SHA-256: `5e2ea574c65981176865c6f849defcb6521eae1ab265b5dcc80bd34b0d2ff515`

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