Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f3d2ca5435525…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 13:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4badf7f56a277dfe0c74f05a2db0f3ed SHA-1: d8e847a449ced0aed7c84f19679f3206be0cd352 SHA-256: 846f3d2ca5435525aa520f2ec04febfdff3eb63062b5ccce93bf4d22152792ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators further supports this. No scripts were extracted, but the overall structure indicates a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=perfil+lipidico+valores+normales+pdf PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe83318acc---sarilonojufe.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/53521801286.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jcrq5mli25b10524slj53pvku/69564022093.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/17235493688.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607877efbe395---xirorove.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/841dc91a323b3737fda9d41b807b0937/20098338622.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/f12fi4qv6ju41nosb7r97368vo/88950610950.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff28cf0471fd20c2b44914b2c9eae34a/tovumudonurudilikel.pdfIn PDF document text
    • http://hak-al.com/resimler/files/lefonofurivefasusi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1e3b1d4a---31821623608.pdfIn PDF document text
    • http://vtaky.sk/media/file/33338871770.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/8265509875.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/22137089144.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/xizavavogitewaboruge.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/widuzamijodipaxijo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/ripekiguze.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bedeb10iu2qgogqgscb2gr4v53/deduzajobose.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3a3qgpgt71jkp0iprb8dgcc2o6/gonigupukixebabepopadap.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/9b5e64f02d030b35fc5482a73eda7073/juzigoganisitewer.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/21052136778.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c88196ce5---lalitowokokuju.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_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 16764 bytes
SHA-256: 96d9369cf9997910ae4683ef820fb7b83762642487f18ff81c866b4b6aeebe35
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 10748 bytes
SHA-256: 31161347b6f12bf046ae3b1f728aef1caccf17a9c158809183687a78fc65c1e1
font_02_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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