PDF malware analysis — malicious · ea33c386a3590294

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 16:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: fe9a0585e481694a9542ff7e045fc669 SHA-1: 22396921a6f97d0a1bc68be40336e5fe7af9e267 SHA-256: ea33c386a359029439272dc984c5636e39528a51deb25f34b7399464a3caae8b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content. No scripts were extracted, but the heuristic findings strongly suggest a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.6197

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://queure.ru/uplcv?utm_term=anoboy+sword+art+online+season+2 PDF link annotation
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133452c8e4b6---gagimiludaw.pdfIn PDF document text
- http://mistral-paints.cz/userfiles/files/jowiparesupabafox.pdfIn PDF document text
- http://myshopgroup.com/userfiles/files/70375258987.pdfIn PDF document text
- http://drapikowski.pl/uploaded/fck_files/file/76763519361.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8107397f---1478999779.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9b574d09a3a330307e0587d3d8d81758/siwetitewawuketinobubegi.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25a6c0ea7---31420926174.pdfIn PDF document text
- https://ovistar-dz.com/ckfinder/userfiles/files/kifamadarupopanu.pdfIn PDF document text
- http://tuzy.pl/Upload/file/58785183685.pdfIn PDF document text
- http://jawarakreasi.com/file/xewik.pdfIn PDF document text
- http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/88306868796.pdfIn PDF document text
- http://www.bargiel.com.pl/ckfinder/userfiles/files/xugitidi.pdfIn PDF document text
- https://value.ae/userfiles/file/xovegetekisow.pdfIn PDF document text
- https://projetovm.com/uploads/files/40017503954.pdfIn PDF document text
- http://89928386.com/uploads/files/202109161047459916.pdfIn PDF document text
- http://agro-pasz.pl/ckfinder/userfiles/files/gaxijomoxadigegabijote.pdfIn PDF document text
- http://duda-tech.pl/dudatech/upload/file/14981734457.pdfIn PDF document text
- http://collectifff.be/imgdb/accueil/files/84960050389.pdfIn PDF document text
- https://jpjplumbingandheating.com/FCKeditor/file/pafamusawixopubug.pdfIn PDF document text
- https://newdesert.pl/userfiles/file/24629151564.pdfIn PDF document text
- https://miguktour.com/FileData/ckfinder/files/20210904_2EDB77536191AA04.pdfIn PDF document text
- https://mt-creativestudio.com/ckfinder/userfiles/files/96046751557.pdfIn PDF document text
- http://verypool.cn/images/upload/File/vijebikeg.pdfIn PDF document text
- https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/95720640512.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_off0000d8b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8B5	10680 bytes
SHA-256: `153cc74f7c7613f0ff464e61ffdf681e814096db7a3a5edb0cc11814994d9e42`
`font_01_sfnt_off0000f17b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17B	20788 bytes
SHA-256: `39dd446102c5db07ad601e51a49b4e06c1c5da0f805528b2c27fb1f68e0379cd`
`font_02_sfnt_off0001283d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1283D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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