PDF malware analysis — malicious · 308af36a35860689

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 08:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1996316491dad0ba830071e7ea8964bf SHA-1: 61e05d29f2c526239289afa3a124a7e3ddaae7ad SHA-256: 308af36a35860689318a4e2e8a3b0bebed0843df71260b09899488bda1b1310c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, primarily serve as a mechanism to distribute traffic across various potentially compromised domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd0dec65a---8341792070.pdf In PDF document text
- https://profix.fr/ckfinder/userfiles/files/54334574281.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/404b5822b0d9ecc6995014a96533b8bb/bafexebodiguzozavowuna.pdfIn PDF document text
- http://dietmoitangoc68.com/upload/files/sarulawipigakowagir.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/gesowipawuvejosajud.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/91545687639.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc85ad30a5---9252025871.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/87746891518.pdfIn PDF document text
- http://dolphinkorea.com/files/files/busaj.pdfIn PDF document text
- http://chithanhplastics.com/uploads/userfiles/file/zinazeragaxuroxitegil.pdfIn PDF document text
- http://ff-engineering.com/userfiles/files/16668999747.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/49831ae06d00c791e008237762d6c886/2964639203.pdfIn PDF document text
- http://speckletrack.com/update/editor/file/65404648997.pdfIn PDF document text
- https://ltssinternational.com/res/wysiwyg/file/zavegakalogasagekew.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/978b8b5942e1531a483c5cd9cbba6f14/nuwewagirogaxi.pdfIn PDF document text
- http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53221287190.pdfIn PDF document text
- http://www.vinoplaza.nl/img/upload/files/36221745585.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/97963137590.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9q35vqc3do1p2o56f2mqddv186/3235032690.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b427aa3a2---92987539012.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f11364f5813442304a3015d8337de8d0/56448411024.pdfIn PDF document text
- http://fujavietnam.com/images/Download/taviwos.pdfIn PDF document text
- http://uniquecharacters.com/upload/files/54730735310.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s1m8rh37h5s2ho8j0nequfdpql/51645851827.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2def328983c2cc4ca74065bfdb276bc5/xunirenotizuz.pdfIn PDF document text
- http://smit-electronic.hr/upload/datoteke/52416645575.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ncert+maths+class+10+chapter+11+solutions+pdfPDF 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_off0000b7f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7F1	17112 bytes
SHA-256: `14578701e51c3f5f3fc3c8ca1ffee869de0716ff4cf6ca7049654e17ebcc74c7`
`font_01_sfnt_off0000e3a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fbb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB9	11136 bytes
SHA-256: `d833f0bfed13211df19704563ea5768c8fab33fca7c2d003074e068d18051719`

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