PDF malware analysis — malicious · 11e71b52faec69ff

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 15:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: c969dc108c3746bad36a6ba3e4c44851 SHA-1: 20b229c3091437951f9817c01e059f60b15e0b52 SHA-256: 11e71b52faec69ff4658856a0142d967c02b7e825af77400d2a06c96d8b3529e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for SEO manipulation or to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/gixuxevo.pdf In PDF document text
- http://akcjonariusz.com/UserFiles/file/77197957980.pdfIn PDF document text
- https://nullemont.fr/nullemont/ckfinder/userfiles/files/33881169619.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ed810a62---92414397438.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d17dea311f922805992cd197518ab461/42884358544.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160984a87dbe4b---6758202396.pdfIn PDF document text
- https://ksboutlet.com/file/files/98315560075.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2628075996---22602204255.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/vusipuzagibanujipabower.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/972aaea6b928e1ec4eb5624e0d269c7b/vovidibebijujaje.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2af44d3f---lotuzurizadakikiwete.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cf9e88f0fa4746624a18a1d90f368185/45174205815.pdfIn PDF document text
- https://dbmotorbrokers.com/userfiles/file/34393572538.pdfIn PDF document text
- http://sattosushi.com/uploads/files/30262385041.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5a831d5ccfe51cc12ed2023bb0bef999/57934452844.pdfIn PDF document text
- http://cycling-software.com/files/file/80134406214.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc74e277e---rodav.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/07/01/file/20210701_194752_180.pdfIn PDF document text
- http://onnetsolution.in/userfiles/file/xosilokat.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5ca0d473---litaduseripodanos.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/xonukenogisunav.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9c0fe44a87e62d834658fdbe9970fdf0/sepenagoborifix.pdfIn PDF document text
- http://webinside.pl/userfiles/file/1175198399.pdfIn PDF document text
- https://directorvincentchow.com/fck_filemanager_upload/file/4276280353.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/lepasiripivogo.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/81032776055.pdfIn PDF document text
- http://dynamic1984.com/user_file/file/96512834096.pdfIn PDF document text
- http://collectifff.be/imgdb/accueil/files/gonolakawux.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=post+graduate+diploma+in+biotechnologyPDF link annotation
- 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_off0000f0f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0F3	17276 bytes
SHA-256: `e7529bbf941b3ee114da38ba4da4b01db126387fca42538f53b92e34e15238a4`
`font_01_sfnt_off00011deb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DEB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013602.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13602	11316 bytes
SHA-256: `bc9a8bd7a4404308717816f44782ac9df6dc9546a969d51c9eac9ecd5a822408`

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