PDF malware analysis — malicious · 89cf7ddde18616e6

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 19:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 49feba91ccf9c1a565fed3096690d134 SHA-1: 7cf5664ed4af9da887b12d5f97885cb73ab4c125 SHA-256: 89cf7ddde18616e6ceabc88cfffd2fad4152e2abbfa5d2aca4a7859b98695322

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy of using many distinct, low-reputation hosts for redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=crary+wind+system+parts+manual PDF link annotation
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/d5g98oakccldosrjjtg4vjgl4c/familewekafarofuxerimopo.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5c408b02---nikeweloxoxogowezetelet.pdfIn PDF document text
- http://ekotop.eu/userfiles/file/betudozisedodat.pdfIn PDF document text
- https://crpm.ch/ck/ckfinder/userfiles/files/rivopimu.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d4357c5---rufobozi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13875e2c1e---9128161255.pdfIn PDF document text
- http://www.sm.ac.th/ckfinder/userfiles/files/soxedapaxuwineralirapazat.pdfIn PDF document text
- http://kistours.hu/userfiles/file/28423883381.pdfIn PDF document text
- http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/96494438552.pdfIn PDF document text
- http://shmgec.com/Uploadfiles/files/21580708875.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021072417210173499.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c65c7872b---80737224678.pdfIn PDF document text
- http://satyavnetworks.com/fck_upload_images/file/difumenukafuzos.pdfIn PDF document text
- http://haciogullari.com/depo/sayfaresim/file/31549233199.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/77opin3t912kqkmg7bjl4949qd/1665607541.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fef772f16b3fd52dc1f143ed2aac6a68/6376400248.pdfIn PDF document text
- http://aci-immobilier-douai.fr/userfiles/files/gisorujuxalitaginodapeg.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/tifijirilukigo.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/silhd2ulk2rk2r9mmuao0ugpve/47216475344.pdfIn PDF document text
- http://bakefruit.com/uploads/files/202108291349433605.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///wamavinaroragasujepojizex.pdfIn PDF document text
- http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/32764508018.pdfIn PDF document text
- http://marta-galan.com/files/varios/file/79971740437.pdfIn PDF document text
- https://auto826.com/uploads/files/xirinegetevulij.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_off0000bbe7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3FE	10764 bytes
SHA-256: `271e6fd2dd0dcb246a90c96efe74d7973f3cf7a2a1a8df574266902cde601076`
`font_02_sfnt_off0000ecc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC5	17376 bytes
SHA-256: `ef1c9fbf27eee6f28e6defe29bdd6e42b4d4e95be6ff27da666a9d3fa691794c`

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