Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e6d552c81bc96…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f913c70c6f238f46f1349f6cb391f97 SHA-1: f067d95e4a0fc92603936ebddbefba96fe9d5e8a SHA-256: a93e6d552c81bc96436474cf0190ecd9c0df4d391a41ee4349cd05371b2cb7c1
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 as malicious, including a machine learning classifier and ClamAV. It functions as a link farm, directing users to other PDF files hosted on compromised websites. The presence of numerous links to potentially malicious content suggests an attempt to distribute phishing lures or further malware payloads.

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 http://glina-master.ru/admin/ckfinder/userfiles/files/4279512180.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bc81cf56---23144927962.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/julakugexatasozevudijeji.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/ragepirajiziratixopagi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af43a248bd---80945622584.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fef6e95b4---65021915442.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4cead8bdda39d28f74e45feaf81ab9e9/titaregixibe.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wivewusaxigujam.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/guwikepovilepejazevug.pdfIn PDF document text
    • http://cmtsport.com/pliki/3506075118.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/76381094433.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/23572866985.pdfIn PDF document text
    • http://unibox.lv/files/text/12090662942.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/41991723050.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04a65df2f97556ec05c37c7bd4496e02/gizunexijogamuso.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zekirubanijajalusovu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nigonusoborififaxasofux.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b71bc73c5af89a11f6eb1926e64c30c3/gisudone.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c79b76e1---54812922333.pdfIn PDF document text
    • http://flirdining.com/uploads/files/fimelozotumatozu.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95985503266.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/mofatabetazatejagerotid.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/wopedeju.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wixoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=integrated+natural+resources+management+pdfPDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 17884 bytes
SHA-256: 16bf2b11c0f172af19ee6193806980658b93690ec73992ee2a213429bcb60fa2
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10924 bytes
SHA-256: 22dfdf5c0db51227ff52e449c004522044847b69935d38376bcaac0909a8c448
font_02_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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