PDF malware analysis — malicious · b839d6397d1c77c2

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 16:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f120b2abf8d4bf6a8978ec39df8641de SHA-1: b443b8e39e0d271a98e1b6aad72b9d35219a2cc9 SHA-256: b839d6397d1c77c2e407d7430d48365649723fb915eeb4855e2ce2e755d23577

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=masque+africain+%C3%A0+colorier+pdf PDF link annotation
- http://bburago.info/admin/fckeditor/userfiles/file/86377680917.pdfIn PDF document text
- http://project-lovcen.me/userfiles/file/sinukoragi.pdfIn PDF document text
- http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/30077781770.pdfIn PDF document text
- https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73df73e0d---72061461917.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r2pve9lacd17q099bka3vnuole/97529405711.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b009df3a10091a7720c77955e9196f40/mituxoxeriduw.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8af730553---75012832396.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/cc412a95568d8fdf7f59a9f63e16c5a0/37771816441.pdfIn PDF document text
- http://castrolmintabolt.hu/images/upload/file/11895725863.pdfIn PDF document text
- http://pgnsualumni.com/clients/872691/File/58997926315.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c9a4a4981671f85ec7e193f993b5a753/zitoxomi.pdfIn PDF document text
- http://tpdw.pl/userfiles/file/76139004130.pdfIn PDF document text
- http://phuongninhphat.com/uploads/userfiles/file/kidudowid.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf48a95bf43---11939865361.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e99d983e874f23876bc1ced569e83bbe/46709367699.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9d6a11a32cdc33c62b76194fdebd3392/47275939331.pdfIn PDF document text
- http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijelakedes.pdfIn PDF document text
- http://chineseclothingonline.net/File/1149813834.pdfIn PDF document text
- https://malashealthcare.com/userfiles/files/zenoluviwonamatibuvijux.pdfIn PDF document text
- https://mmagame.com/userfiles/file/5168264142.pdfIn PDF document text
- http://www.toeterloeh44.de/files/varadapifowudajuj.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles//file/2539818839.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161101757a5ca0---54757766585.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_off0000bb43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB43	19132 bytes
SHA-256: `3984b8fab5150a319b26b681d0f254bac4538861f23e82dc0cd129f7836a9069`
`font_01_sfnt_off0000ea49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA49	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010260.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10260	10940 bytes
SHA-256: `5f713dfa118dc484065448110510fcf0622e472e939df4fd917405b0d61ac3ff`

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