Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a89cf03add11cf…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 00:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdb95d04a1b93886e5696aa00f9d1f98 SHA-1: 382086098933d3324c6c23ddd9a3c9561fa97280 SHA-256: d0a89cf03add11cf064485bf0193d9ab3f592739d40679fffe8fd383b715b41f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This pattern suggests the PDF is used to distribute phishing content or further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mygotour.com/FileData/ckfinder/files/20210904_390F2AC24585E40E.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/72734125779.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210926041256.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/giledumogivabuxobum.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4aca7590d4555932fdbd0f53a8087dda/7245619272.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/81359080943.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/29431233869.pdfIn PDF document text
    • http://agilesolutions.in/uploads/51283460987.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/25754711311.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/77378824634.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/joginin.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/92783353245.pdfIn PDF document text
    • http://slsnn.ru/content/files/lukoribobujuzogimiwux.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/12848220822.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ddecc51a7c1cd519757f9fe1f200b5e/84808334703.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/zokizaduwadud.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/49cd639ab83c0e7f6bd00b32a95e5811/76486183243.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tibapitunudelawoxolirev.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/foligo.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/fatukimavomawewozoxe.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/21382556707.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/lenodasinuvovutonupalete.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/16809842719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+do+you+make+from+a+bookPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 15480 bytes
SHA-256: 2b8d526f729a4fe7df4e5ebe2cb88f13a74187c1de7e907e0d05a7ec89cb7916
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10756 bytes
SHA-256: 22346c9df48a7988355c13329d171784e71789f01e15a1f785eeda5230686cd3
font_02_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1