PDF malware analysis — malicious · 597669f04004973c

MALICIOUS

PDF

79.1 KB Created: 2021-07-30 16:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 901045f4cabbf630fb5a12b00fac10bb SHA-1: 2c4ec8447878253546b804c2a719a8ab9bfe54ea SHA-256: 597669f04004973c7c7a67d1d542966e10945145ef957a8c770b904c9ff8fce4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://lsneotek.com/ckupload/files/misev.pdf In PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9d0sq34jcg9o8u4pjp90niqopp/11937183959.pdfIn PDF document text
- http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/21788076054.pdfIn PDF document text
- http://ibb-online.ru/f/file/91224440934.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a464b0af4ff4a3a5cbe1fbc1f37d8e0f/68071781311.pdfIn PDF document text
- http://mail-ex.net/userfiles/file/sozuvajajugug.pdfIn PDF document text
- http://andlupa.com/userfiles/file/zipawejajutosujuraxokeri.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079661a9a9c6---kapowadidalibejoser.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/motoxukop.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p64gm9kh71361ap8qctggdbtic/2741609583.pdfIn PDF document text
- http://northmarking.com/userfiles/files/12423804171.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9eb62c1652766437e7e100df80f4dbf2/59296873485.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc77a1cb09---72994209662.pdfIn PDF document text
- http://bige.vn/uploads/userfiles/file/fujezolujibu.pdfIn PDF document text
- https://boyanbolyarski.com/userfiles/file/radaxikakudutasebimekenaz.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a4f457562---86381409109.pdfIn PDF document text
- http://jtylek.pl/Upload/file/jufigufebiwulisojejeraxa.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af54847dda32f2860b771bbc65c9283a/85758852965.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/648c4665302aad34724a569264553958/6416843149.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/303a932410b5cc6454fbf2af0c2723e7/waduxavubipabom.pdfIn PDF document text
- http://photou.cc//ckfinder/userfiles/files/kofotewukubuvajulunawos.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d016e396ae2---38677907560.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/16396317012.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/oad37qmb9p16e2l9sue1rovbu4/92615049449.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083a158e0c---21679695053.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb229d0e0---79786035129.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hagure+yuusha+no+estetica+episode+12+facebookPDF 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_off0000cf1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF1F	11460 bytes
SHA-256: `9cf0b8ae788a1a3823fe193135314d8f2c58662064c9f0bfb32025e75dc23b39`
`font_01_sfnt_off0000e9d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D4	17220 bytes
SHA-256: `772ebb78d10e43619ba1b7760a81bbed9cc71c43032eb1fa7f0f1e3b938f729a`
`font_02_sfnt_off0001169a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1169A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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