Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791b57a6ac03659…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 03:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5fe9a64442534571901027ef3fbe175 SHA-1: 848d7c9836eb9e70c7717900c20402862e6b3dbc SHA-256: 4791b57a6ac03659cc300360e116b743ea02181b0eae5ed1135f8f0233e2ea64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of these links suggests an intent to redirect users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=possessive+of+a+plural+noun+ending+in+s PDF link annotation
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/25b6642dfceba75c9faa7954def5aaa4/98436079527.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/18301283524.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9ec0fec9---93236873899.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/45972785409.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f80933a7c---molupadunotifavewu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/6216090345.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb1d7cbe3---rajumozinixabixaxonige.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/054091fd56af56e7130078f769ad455f/kuzerosesi.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/dutinovozotewef.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38734499946.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d2fddaf87954bfd3c5fdbedfe4574fb1/dozilu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/50543507590.pdfIn PDF document text
    • https://majubesar.info/contents//files/80821780352.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092754ba980d---kekajonuwubil.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160954f694fa3b---kasusixinuvavotinon.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/29369285829.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/tarabofidarit.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e995daa342---pelalozaxis.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/80223623800.pdfIn PDF document text
    • http://sam-global.info/files/file/30833561727.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/xisiwabuki.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v0rmh7jsm8ciqu7gs0af0d5qca/95490025072.pdfIn PDF document text
    • http://askort.pl/Upload/file/42696315182.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10740 bytes
SHA-256: 54570003c6d39b9ab5939da7fe7ed9616b77111cb35b59a7b7a3332514988e21
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 18416 bytes
SHA-256: 7e95eceb658ad54a0a2f9d4250e3a9e349c6504b237566add34a65896bbaa927
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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