PDF malware analysis — malicious · 86162f3f8f27a5a3

MALICIOUS

PDF

80.7 KB Created: 2021-07-02 19:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 3c0a373aac916235096ae5a3a43531ee SHA-1: 020c7df1ded4bee357260ea5adfb6eee388fd25e SHA-256: 86162f3f8f27a5a375c32ae489cc9f9cb09a9d1c879e04b5b2a4baef46af1a1d

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 Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware payloads. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=unless+you+hurry+up PDF link annotation
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955b3e4eb---81845785781.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2df021c5---51819091769.pdfIn PDF document text
- http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/wenewinugaregodematubam.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/85eb14ae575d66f7f2eb4f554bd36f5c/gitugubatotanusoretup.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a507fd7---bofejividapefuxa.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/faadd5ea3b10237f10e6d37027bd7a10/jubapufunizedif.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c929fc09e16---tabafumexizufosufagewep.pdfIn PDF document text
- https://alibabaoman.com/basefile/alibabaomancom/files/98443318895.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/72196259979.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gqgiigugsqsgc772cr95bjhi1t/sekuxifiv.pdfIn PDF document text
- http://beiks.info/public/file/90698249486.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a77059690---59820755016.pdfIn PDF document text
- http://goldnumber.info/userfiles/file/gekomefazop.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5197c2b137---mivuxenojetumapi.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/36430375157.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c24a1a2f5---pimus.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dlncpoj5m7fa98he1hn2noits7/nigabitobu.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd1fe8b6e---69992557467.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713b4c93ba---zozoxelokuradu.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5ceb49b35bddb423fe294a4645345d0d/85870578679.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c2370593fc6126fe2bf9e397b82007a/29491990929.pdfIn PDF document text
- http://nsk-nalogov.net/upload/files/12935989847.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877f6e2ebdb---niporil.pdfIn PDF document text
- http://krzysztofmalec.pl/gfx/fck/file/timanukekajoredetexu.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c358dc0---26456626599.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_off0000d64f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD64F	19348 bytes
SHA-256: `0def9365df088d5772270b26497a35e572d957b1f917e0f01fb09e7740bf50f7`
`font_01_sfnt_off000106b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B0	10216 bytes
SHA-256: `89b6b271fee72c2a87d9e71495d2777f4cbcde568d1467ff286d16e94d8c4bfd`
`font_02_sfnt_off00011d99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D99	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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