PDF malware analysis — malicious · 0c7a5f693cecc4f5

MALICIOUS

PDF

89.5 KB Created: 2021-07-13 20:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b63967a97a277319f6a0b371f58e55aa SHA-1: d5595cb3522a3f3310dc8b07ad605d49543ca746 SHA-256: 0c7a5f693cecc4f5e9242fb8c29810057250ef1f49135faf07de088bc35f09e9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier's high confidence score and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://dok-vo.ru/userfiles/file/90018950233.pdf In PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/afb9712676475e28bdde37d5d6c94d8a/fojudosamitifafifoxag.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e31679e556d---falotasot.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/56qi27krs4184nmc25j5q8rao6/vogudedidekafifinutidezi.pdfIn PDF document text
- https://bepxuyenviet.com/upload/files/mezotexoripexopazonezupik.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac08fd403ea---jevubev.pdfIn PDF document text
- http://usmleworkout.com/files/file/wafewel.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be7806db27e---6667733853.pdfIn PDF document text
- http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/53976194429.pdfIn PDF document text
- https://agroadvanced.com/app/webroot/newsletters/editor/files/32646945775.pdfIn PDF document text
- https://hosvagyok.hu/userfiles/file/bivurojewadoxezebeseruva.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/jidijoxewasarasitixosaxan.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076497184ee6---72634237177.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bcd183b1d---9732973667.pdfIn PDF document text
- http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/tixezogipudebutajoxitex.pdfIn PDF document text
- http://abnicum.com/files/file/17929155662.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b929d6fa9---zovivunezije.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/256d7c6639cbfa5d49fa18faedc728e4/76798240996.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/xanasemu.pdfIn PDF document text
- http://grawerlik.pl/userfiles/file/34749072323.pdfIn PDF document text
- https://mtmnetwork.net/uploadEditor/files/netakolifagakewu.pdfIn PDF document text
- https://artbynela.com/uploads/file/31471139245.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5090b31591098f7689cba26b8b670629/bifidodadasonekejebomu.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e606ce558d---mokafowixi.pdfIn PDF document text
- http://iwilldoit.ru/uploads/files/files/7440863238.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=from+blood+and+ash+book+3+read+onlinePDF 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_off0000fcad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCAD	10796 bytes
SHA-256: `9a341c97f949c82862189fbcc524d3d9dfb8be75aa1cb8aed6b5c67dab26ff52`
`font_01_sfnt_off00011549.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11549	16920 bytes
SHA-256: `157a4a08e8e2220ece6727d2aac1d812d04a816ac4130dea48b2ce6d1021a575`
`font_02_sfnt_off000140bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140BD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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