PDF malware analysis — malicious · 8faaf855078fcb78

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 18:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f9c1e123840e6f6624305a8d2221a24d SHA-1: 8e11aa0ab22b194b23e8b84a0ad2df00ac8b52ff SHA-256: 8faaf855078fcb787dfc023c4226a3afc3f2cd4aad98702ac15d3c1881bf27f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=apes+online+textbook+pdf PDF link annotation
- http://skogsformedling.se/bilder_umeny/File/61449591999.pdfIn PDF document text
- http://nktrading.qa/file/files/34013889731.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efddb07ef2---6090840000.pdfIn PDF document text
- http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/24948917426.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dgr28o7mhittmog2u0plah0u9c/xalesifiwukusutu.pdfIn PDF document text
- http://metrocars.london/survey/userfiles/files/86482365896.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3217386c9d32242edd462090cc08f790/10984761447.pdfIn PDF document text
- https://an-professional.ru/img/files/file/25876103850.pdfIn PDF document text
- http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/delitebofubojo.pdfIn PDF document text
- https://ladangmimpi.com/contents//files/58132318762.pdfIn PDF document text
- http://kimyasaldubeller.com/upload/ckfinder/files/luwakavolon.pdfIn PDF document text
- http://cinebuzz.be/uploads/userfiles/files/rilubikoja.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfcdb593b1---dakimatonizixu.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/fu2088b36uqpfqou9ru62lap87/mavivotuxatedimule.pdfIn PDF document text
- http://aryajob.com/user_upload/file/tebexuz.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f251f94336d---15093932867.pdfIn PDF document text
- http://webinaris.biz/ckfinder/userfiles/publics/files/todebavedisodozowevesoto.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/afbf2d3867185dac8fc32fed46f2b47f/mipevekawisowubovokap.pdfIn PDF document text
- https://247hvac.ca/fabulous1/uploads/files/dutumef.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ef56c16c---82735517012.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161123003d5c58---37264240877.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6c8cc1f---53940520598.pdfIn PDF document text
- https://hpsoft.shop/upload/files/9060537831.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075277ce0b0e---divewatopowarinutatomaj.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad7bc6f46---60363911393.pdfIn PDF document text
- http://utopbrake.com/uploadfile/files/valal.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/18dcc11d7155c8f19fe637f7c981c78c/gosekerumupidabananimaz.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_off0000d0a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0A7	17100 bytes
SHA-256: `59e103151ebf6f5fefa8d3a7c895f9ad9dcdb8666c4043f6ddebe7f9250c692c`
`font_01_sfnt_off0000fcb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCB5	10544 bytes
SHA-256: `1937f40da394908343404fc18103688a9938d5838d0493758ef839ff47274006`
`font_02_sfnt_off000114ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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