PDF malware analysis — malicious · 6f38a06329231cb3

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 16:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 45f072b77552ee4074e26bf04b57cd59 SHA-1: 0b2209ea8cdae1fd81589a62cdd6c80fd87d3546 SHA-256: 6f38a06329231cb3dd3f06e08f9f55d3096f41f02b91a73220d330d20588c481

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://shamayachts.com/upload/file/30768882834.pdf In PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/oq8p7vjg9nfkv5b7joo140pkfi/14218214525.pdfIn PDF document text
- https://cuichi177.com/uploads/files/202109021522444477.pdfIn PDF document text
- https://asiastudy.in/ckfinder/userfiles/files/befibaxalujigifusixep.pdfIn PDF document text
- http://teusz.pl/UserFiles/file/wutebakeretukoze.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f882fa6e4c---senixetopomez.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gur4if3pnb2sqqdlhkn6v445p3/nibepavexapebutizibi.pdfIn PDF document text
- http://www.astmalek.cz/obrazky/file/89012816919.pdfIn PDF document text
- http://paitoonbox.com/userfiles/files/lanonoxa.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133df512fd2e---gugomimivelul.pdfIn PDF document text
- http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kadepewakobibojelijewi.pdfIn PDF document text
- https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
- http://thebeautyofdesign.nl/ckfinder/userfiles/files/basisevagozakodorudeduz.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1188850257fc197216d1d56a6033b289/8871222721.pdfIn PDF document text
- https://datxeninhbinh.com/data/dulieu/files/40997232703.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/1138991040.pdfIn PDF document text
- http://toyotarent.hk/FileData/ckfinder/files/20210903_C9000659130E519A.pdfIn PDF document text
- http://spy-military-labs.com/userfiles/file/tigaxugoxezivureko.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/979986c760d5bee01aeda7278c7b108e/14650257190.pdfIn PDF document text
- https://samuelben-horin.com/userfiles/file/72672506709.pdfIn PDF document text
- http://hunicorn.hu/userfiles/file/4106086632.pdfIn PDF document text
- http://hai-bi.com/uploads/files/202109101231491821.pdfIn PDF document text
- https://eghamatsafar.ir/basefile/eghamatsafar/files/vujive.pdfIn PDF document text
- http://consoles-a-gagner.com/fckeditor/userfiles/file/fefulefogo.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7b30c4b8---zudisadubivivoruwumajuzu.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/soxojibuwanitovosovunon.pdfIn PDF document text
- https://msiutilities.net/documents/54364603549.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=simple+analog+clock+widgetPDF 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_off0000e2e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E2	10840 bytes
SHA-256: `f50a8b12b13e643ebf26452dfdd991aa9c629fa2d8179450a20d0f01bbe92f89`
`font_01_sfnt_off0000fbbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000113d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113D1	17888 bytes
SHA-256: `5bbcba9cbccb933d09d539a8ddd27aedf0dafa8abada5a8d80e796806c9ce2dc`

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