PDF malware analysis — malicious · 70e49f5e53766c5a

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 11:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7fda9ff08d29e70bed2b0d195a380c1a SHA-1: de002c33740669eb0fb7b987bca0331c08b7cd6a SHA-256: 70e49f5e53766c5abea6a464160f0b45b14d039a4e0337933de56c62516f12ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 https://irlanc.ru/uplcv?utm_term=nelson+textbook+of+pediatrics+pdf+free PDF link annotation
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16108bc171d410---99267481893.pdfIn PDF document text
- http://friulanapanini.com/images/file/satopigopubazesixikeze.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbb827682---ziritujenu.pdfIn PDF document text
- http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a616e9ba9e---95013843786.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd9e741e9---41579416341.pdfIn PDF document text
- https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/27084565659.pdfIn PDF document text
- http://cupta.org/userfiles/files/20210612212512.pdfIn PDF document text
- https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/2cdvvq9uopvssj16kuihtnu2e8/sesixaluxaninozomunore.pdfIn PDF document text
- http://best-infosystems.com/userfiles/file/bokedulegazi.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8856a1870e---54768749743.pdfIn PDF document text
- http://teraval.cz/res/file/lesasajodezezedudonovadul.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/gagebololeredijofonenelo.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tekojijiduto.pdfIn PDF document text
- http://beiks.info/public/file/89408225691.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16090f10d8924b---22749110733.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/nugeropinazafosoxadanibop.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824ba01ecd7---12402001786.pdfIn PDF document text
- https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3e37e15083f5469ec806a8c51256ab3/20018130277.pdfIn PDF document text
- https://marosme.ro/hirek/file/35671402026.pdfIn PDF document text
- https://0800-707-808.com/upload/ckfinder_temp/files/20210816182042.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2f4b1c023c1ff719d4d89a1bf4339007/66327053108.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd5a1d977---vulevarunegemitano.pdfIn PDF document text
- http://poorclarescork.ie/images/61301291352.pdfIn PDF document text
- https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/657232493.pdfIn PDF document text
- https://www.studioline.ie/ckfinder/userfiles/files/nesugipizido.pdfIn PDF document text
- http://snotlicker.com/clients/10243/File/26786381825.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_off0000cb89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB89	17864 bytes
SHA-256: `9a0aaaca5355138d4321b282c0712057edc64beb1f42e405a5d535a96567639f`
`font_01_sfnt_off0000fa1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA1C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011233.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11233	10924 bytes
SHA-256: `cdb81350085679c487c90892b7d970943b3f85fdfcafe54daa8190fc5a7ca74b`

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