PDF malware analysis — malicious · cf3c2555767e5887

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 17:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 84d9275e48c944e70db0cbec5ec07281 SHA-1: f76a5a610f50d020196bdac9cfe6fd1cfca9b5a5 SHA-256: cf3c2555767e588719aceec88c20c04c4870bc6a1496ce75e265334667393dff

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external links and the PDF structure point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 https://crysiq.ru/uplcv?utm_term=action+plan+template+pdf+free PDF link annotation
- https://sealskinz.ru/files/file/35770478263.pdfIn PDF document text
- http://perfekttorun.pl/pliki/31179250437.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2a19632dd4c152b54785062f0c138ce6/99562196959.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/nikimosuzap.pdfIn PDF document text
- http://dentish.ru/ckfinder/userfiles/files/77336427727.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076389aaa929---lunoxosumaluwimepobuvawid.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085803af3b89---rokajitosaxifisa.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb90d5cf8---36483538343.pdfIn PDF document text
- http://shukokai-voves.fr/userfiles/file/16275741387.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/33c56436d8494f26fa561244e518f0ab/wupaf.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0a8757477---wufidadojubev.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/meliriwudajaxebefude.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161076b986cb16---52717809371.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aba17467a3456291521f6890228930be/9254809646.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/63351611097.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6e29b296---robosixiluteruwovivoli.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ec19e1a9ca1e64788b1fbc661ebea87/47132977412.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b2b044bf3589375670f78a2896f36695/75295321246.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c100acbb658---gijunavelu.pdfIn PDF document text
- https://ajitcoatings.com/uploads/58168091078.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/937b09131179d71b12d032d7a03ac907/31540387314.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9cptqci07ghmo6m6tap7kblnc4/jevemivibagomez.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071453cade30---fadoxaxasasadejidebifovos.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/4759575266.pdfIn PDF document text
- http://miyozenemeryville.com/uploads/files/92292409193.pdfIn PDF document text
- https://theshamrockpublecco.it/file/jemunusejinefu.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_off0000ef8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF8A	10596 bytes
SHA-256: `ce88e8acbbe6d9a697e4d19bf8d2582e92cc1724c61216548261556b6f46af31`
`font_01_sfnt_off000107af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107AF	17588 bytes
SHA-256: `f9e9e6053250581cc5ef033f9381dea2e391413d7eb1a5e7c362c9150b7ef51c`
`font_02_sfnt_off00013558.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13558	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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