PDF malware analysis — malicious · 25c3711333179a64

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 05:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4a7eaf8924fe71cb421067506a3e877f SHA-1: b560d58aba88290c81e5c657f42ec3dc8890cea5 SHA-256: 25c3711333179a64efa9c9b4e2ca4893514ca9193a02e710c1d4aeaa60a2c2bf

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, specifically identified as a phishing trojan by ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=abs+cbn+tv+plus+user+manual+pdf PDF link annotation
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cdcaa5678---82647240455.pdfIn PDF document text
- http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzave.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3177dc1a8---52102362015.pdfIn PDF document text
- http://dispensapertutti.com/userfiles/files/4504067822.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085569a12118---16454742895.pdfIn PDF document text
- https://civilkontroll.hu/uploads/file/gudefufuxamebebi.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/xaruxuwedowozekomur.pdfIn PDF document text
- https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/12273663076.pdfIn PDF document text
- http://auxerretv.com/content/public/file/5520973306.pdfIn PDF document text
- http://myredm.ru/uploads/file/55466303882.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/ganudawejonagemodefejanij.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/vukurovubakowozexovirota.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/nm7ed4ncpsq918p37lgd5emna0/1064879608.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb53ce9---44529115996.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/safafagapezasajajorawen.pdfIn PDF document text
- http://ingmarcofaedi.com/userfiles/files/lisetibewut.pdfIn PDF document text
- http://polymer-optix.de/userfiles/file/80887235026.pdfIn PDF document text
- http://solarhomepage.ch/fckeditor/editor/images/file/wuxuvorafe.pdfIn PDF document text
- http://serbanindustrialconstruct.ro/uploads/files/milebefanisigoxurax.pdfIn PDF document text
- http://studiovalentini.eu/userfiles/files/tavotelewenawabobil.pdfIn PDF document text
- http://beateromer.com/bilder/file/repelidujivoreliparud.pdfIn PDF document text
- http://kanchanaspa.com/ckfinder/userfiles/files/19703921168.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc065a95---11849709461.pdfIn PDF document text
- http://manavpublicschool.org/manav/userfiles/file/majasofavox.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_off0000e4c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fcdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCDF	10856 bytes
SHA-256: `3923f1072a2ebd42a332cc631a03c5bfefa4ec10891e207f0866242315bfb2f4`
`font_02_sfnt_off000115d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115D0	17852 bytes
SHA-256: `81ef62cd8b73e6b14cf64feedf278b8debd853e2bc9a8305de1a596e64e7bdd9`

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