PDF malware analysis — malicious · b03920bd392477d3

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 02:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 64a472f6d1253b055af9838c244805cc SHA-1: 35bed6b8bec173b0b7f0fb7db9c860ff9cb8fa79 SHA-256: b03920bd392477d3c79e5e31874c275f10759e8c010b3476dd1e7e0cef8177f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a non-clustered link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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 https://salvatoredivilio.it/userfiles/file/marumevaratosisa.pdf In PDF document text
- http://sahcarpets.com/userfiles/file/lajukutuzuzufo.pdfIn PDF document text
- http://dalboncostruzioni.it/userfiles/files/56641839233.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/hti9nv65u2kg6lfjc0ikqq3jfl/nosikatunaba.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/29064933733.pdfIn PDF document text
- https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/rulejusikuwi.pdfIn PDF document text
- http://bpsstudio.hu/uploads/napesinidipadeti.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c667f896c65---zaleb.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8525ee2---topulasozogerezetudapa.pdfIn PDF document text
- http://soft-pro.hr/upload/datoteke/xevop.pdfIn PDF document text
- https://martabaktelor.com/contents//files/zukodogufiparadijewakasin.pdfIn PDF document text
- http://www.sport-konyv.hu/userfiles/file/masetinuxavepopabulogoror.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vi0imicu2v91gb05cb4fasr7gq/zupelunabawarojuf.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc64fc5b7e---fewojituwowogaligulisimag.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076e69f7452c---bibom.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db3d42d5c---wusagelizopevajibubure.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/90163632087.pdfIn PDF document text
- http://amctop.com/board_data/editor_img/file/202105111430.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1785b6174419f811038aa80f60070164/sevituxuratikuwatunezu.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/meue8jont77tkvm65hfhvhn5v3/72695480368.pdfIn PDF document text
- https://kingyao.com/uploadfiles/files/20210723_131347_7324.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/83044419881.pdfIn PDF document text
- https://fokusmedia.com/images/uploads/jikofisor.pdfIn PDF document text
- http://faradbox.pl/files/file/tozemuruxozonadebid.pdfIn PDF document text
- https://presentkompaniet.com/img/content/file/supijekowedowuba.pdfIn PDF document text
- http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52572116423.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=logitech+spotlight+presentation+remote+user+manualPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bbfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d40e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD40E	15560 bytes
SHA-256: `1235149b821d242729f8f89e03e68dc3b8f44d3b5db13f41b1832375fa16bd18`
`font_02_sfnt_off0000fbf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBF3	10880 bytes
SHA-256: `fd0028ed4b8a14e5f980949472a7fe150b91cd47109f2805c1447a8877bb26c0`
`font_03_sfnt_off000114e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114E8	17656 bytes
SHA-256: `9857c90cf4a04bb95a0561c4ad2cc0ca7f6129ce4500ff27e90e04a0c7a04c3a`

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