PDF malware analysis — malicious · 2eff9f3f29ea950f

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 04:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8c656f07488ef9dd2d802f41ac79d1d3 SHA-1: c32c6f690f06d387fa62e6423bccb30985c5c7be SHA-256: 2eff9f3f29ea950fad4b21166daeea375d7860cea3ed3b37c14d07805c69b753

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a malicious PDF used for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=disegno+meccanico+per+ingegneria+biomedica+pdf PDF link annotation
- https://medicentrumnz.eu/medicentrum/files/file/punuta.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b58168ed4---28807632812.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/865b1ea46dbb82428d71b09bc62cef2b/8722017790.pdfIn PDF document text
- https://satuldelut.ro/ckfinder/userfiles/files/90481875993.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e489468fb79da0cf31384a885482a71c/musejoderasafeki.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca04eac59---wimobebevidovoge.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935a8e84a95---jaromirevijugugotitodapok.pdfIn PDF document text
- http://rghsalumni.com/clients/82979/File/49760119879.pdfIn PDF document text
- http://etkindenetim.com/resimler/files/36404064541.pdfIn PDF document text
- http://jan-fotografie.nl/upload/files/51015728868.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c330847ed9634fbbf60ae25b69fbfc9/66038416540.pdfIn PDF document text
- https://libertyrealestate.in/ckfinder/userfiles/files/23870740740.pdfIn PDF document text
- https://luminex.pl/upload/file/46999813089.pdfIn PDF document text
- https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c7a5c3e53ab43998949dde57920dff50/3940027761.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d9eb7d82---21793747898.pdfIn PDF document text
- http://alexandraharris.com/clients/36054/File/49082663101.pdfIn PDF document text
- http://workcoop.org/fckeditor/userimages/file/20210708163850.pdfIn PDF document text
- http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/wolavazudolejasusuxuke.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a2bfe0cbc58a8bdb4ba4c22b1e15bd19/11456082927.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ph1cl5hjd2dols7rnl7upqngc6/pebaviwoniruxut.pdfIn PDF document text
- http://andreaslasnik.com/data/files/34845052086.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/5511349718.pdfIn PDF document text
- http://siddharpeedam.org/userfiles/file/In PDF document text
- http://vanprodukt.cz/UserFiles/File/jufolukibupasipadimapazex.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8136e43---wagarojimolojovidozak.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/vetenareg.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_off0000d3f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3F4	10960 bytes
SHA-256: `4dba124ca1f53716b784a8af78b685780f84f8c90d6e6ed40bcc95fc71cc7476`
`font_01_sfnt_off0000ece6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000104f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104F8	16620 bytes
SHA-256: `d4fe75f3f6ab366008d4b4a89ee210e7d35ac40b7d6cdbb6a257bf04331587cb`

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