Malicious PDF — malware analysis report

Static analysis result for SHA-256 9711f66063c4efe9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 19:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca76de8cbfc2eca5f7d959bbff3ad1f2 SHA-1: 1adb1ebb121b809486220d44286c17e5a8d93f4f SHA-256: 9711f66063c4efe9d10fb7df84bd80fcaa1c724213e8da46b74f009530e17f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term=app+not+installed+solution' indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a second-stage payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=app+not+installed+solution PDF link annotation
    • http://phupmirpol.pl/userfiles/file/zenesofi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614795b41f415---zamazaxuwakupo.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/95661536982.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a503386bb---33750154732.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fixawupodikesudixunek.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/105e6ee7a577f0a8450c30462398c4db/xuxefijifilojolivifonitin.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/wosorufanikogatumuvirudi.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/27693955201.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/21134958227.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luworu.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/lizimebudumebebomof.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/kasiwopi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137deca2a974---vojeluxorejibapuv.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/2336855162.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/wimarakuluxuture.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109170954464197.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cbd597669daab2ab6b3f2c7a209f7787/40047547821.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/13480798475.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17a3a2905---60097607664.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/dupeluk.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/48758640873.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/xibuse.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/78285229098.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.

FilenameKindSourceSize
font_00_sfnt_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 10368 bytes
SHA-256: 509b3c1a77e5085e7adb10605ee55f4ffb75784dd4af50c2f5a50f432f9ea4f0
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 17188 bytes
SHA-256: 030bae761c70230fdc8af4f69b5efee094e7b92c808f7b96d16205d61c9587c6
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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