PDF malware analysis — malicious · 25c1256473274318

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 18:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 1414ae40e170fdd0163e972a75ddcbb7 SHA-1: 10e6d56e49b735d82cd62e6970cb5b4821ec3a92 SHA-256: 25c12564732743189156248f28892baea9f5936db3ff8c878edf03ed8b16a85f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting its purpose is to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.7417

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://synerhu.ru/uplcv?utm_term=hogwarts+mystery+mod PDF link annotation
- http://www.contectrade.hu/fckfiles/file/bokagup.pdfIn PDF document text
- http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49235339105.pdfIn PDF document text
- http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
- http://mayepnuocmia.vn/data/ckfinder/files/50706652095.pdfIn PDF document text
- http://plaschke-partner.com/uploaded/file/35784661390.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/33968722959.pdfIn PDF document text
- http://neuchina.org/userfiles/file/dokajozuze.pdfIn PDF document text
- https://kipass.fr/userfiles/file/87066529800.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ca6a3eb531a8c67f1c33ae9c28342099/soxonaxuxineraredeze.pdfIn PDF document text
- https://lacgl.org/upload/editor/file/jevufuzexefubimubojewu.pdfIn PDF document text
- http://jawarakreasi.com/file/26048941734.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/50585304267.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/vekatovuwonota.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37053dc7b---zezubolugij.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede528f5a5---85863898620.pdfIn PDF document text
- https://epagneuls-bretons.fr/caningest/images/file/68563502429.pdfIn PDF document text
- https://malayalamfoundation.org/admin/my_files/file/96054476322.pdfIn PDF document text
- https://dongphuchuytai.com/upload/files/panufivedagokuk.pdfIn PDF document text
- http://realcomfort.ru/content/upload/file/45429395412.pdfIn PDF document text
- https://buzascsaba.hu/userFiles/file/15686981684.pdfIn PDF document text
- http://datcat.vn/2018/file/rowenasovizubedu.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/bopijo.pdfIn PDF document text
- http://lnianemarzenie.pl/userfiles/file/36330367512.pdfIn PDF document text
- http://isystem.hu/userfiles/file/78150324726.pdfIn PDF document text
- http://newworldss.com/uploads/file/23171682652.pdfIn 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_off0000c278.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC278	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA8A	17020 bytes
SHA-256: `a379c7de1e6978894e0f7458d3a0dce3a06ed3b5f8757042f25fa762a2694dbc`
`font_02_sfnt_off00010687.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10687	10540 bytes
SHA-256: `235fda02eb457b854a508ed7072b2bef32bb158b4490cef9cfe0ecb879e80028`

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