PDF malware analysis — malicious · 235fb62bbc71f50a

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 04:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d82c2deb5f83f810b3fc3ea1645fa624 SHA-1: fdae2e4537fd367f16fcea0e9799fb03919a8710 SHA-256: 235fb62bbc71f50a7f5c419dc629efa1fcc0a4d8456b85475bb8265413e9bc8b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=worksheets+on+possessive+nouns+for+grade+5 PDF link annotation
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/27ad45f6b7fc7d748da9e10b6d676c1b/foloja.pdfIn PDF document text
- http://zkpower.net/upload/files/72601137040.pdfIn PDF document text
- http://mgocsm.in/userfiles/file/lewejasape.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce774d45a---fidijawikof.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12e937c67---35342647341.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c913c64509---76011060198.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/wavokenojajapalawekitivu.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8aa75211---64435387060.pdfIn PDF document text
- https://xuantruongtech.com/images/ckeditor/files/18829928339.pdfIn PDF document text
- http://penzionklara.cz/userfiles/file/gotobu.pdfIn PDF document text
- http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wapovit.pdfIn PDF document text
- http://10glazsikeyrosa.ru/file/3836323219.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7809ca79d7ae13d8f1728badf232325/gasulakiduxuf.pdfIn PDF document text
- https://lapakunited.com/contents//files/52128955031.pdfIn PDF document text
- http://qunjl.com/userfiles/files/10540389021.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f79d274d0---tawebexanokevosekinuwu.pdfIn PDF document text
- http://katour.ru/admin/ckfinder/userfiles/files/panig.pdfIn PDF document text
- http://morard-mcf.fr/data/Files/gipemaf.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3c405429fefd426eedd0cf1a2c88d8fd/4422886836.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea8b8c4dc---suluponesopurijo.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/87296365644.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803271187b4---pifisatakipesigonekida.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tcgejc6jsga6s4qan45sdpo454/ranunagimitepadanunugi.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6bbe9d9b---tipafiwokut.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/679105bbb591b67a84f81eada42c8e56/rakiwuguw.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_off0000d981.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD981	11116 bytes
SHA-256: `b8fe811a678c242d8f2566915b5ebf168a677a9fe49139d94a374c23c7d85405`
`font_01_sfnt_off0000f353.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF353	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B65	18784 bytes
SHA-256: `55a87fd7dc71146c3c61fc4e4496c2373b22389e9aa0f746f69635ad4cbed514`

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