Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a015b43e9d56681…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 12:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3eee306890478cce6195cb8d5b2f37d9 SHA-1: a4a022a35774eb501b0fe748fbd99f8cae1c3f69 SHA-256: 9a015b43e9d56681f71732115c4d7bb121066cc8d16476ec496ce140b5662b95
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress upload storage. The presence of numerous links on disposable hosting further supports a malicious intent, likely to distribute malware or conduct phishing attacks.

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 http://cornucopiafrederick.com/uploads/files/49455086635.pdf In PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/73455072565.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/mamaxikupevetig.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/95519555211.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/kewatuvorotolide.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47db20513---sabepixelofofudobebirox.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c59gl3lf2bcfh2b2m1aqcaukd1/malupamixula.pdfIn PDF document text
    • https://basisangka.com/contents/files/nijepeza.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a775b4c1---38950216798.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/domamikaxurit.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914192541.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/3341819507.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/dumimabafulojobimurito.pdfIn PDF document text
    • http://vititanon.com/user_img/files/38856647675.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/fesitalamogudopa.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/jagewuvagukapadafasix.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/fawelolunipex.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pagegeju.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/takibetux.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zuxedadobote.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/bitadebukaxizokinewepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+video+maker+free+app+for+androidPDF 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 17172 bytes
SHA-256: 36a9c509ec608b47ab1c3e011b90f02a717c5ed96eaa624a51480e2b458a48d8
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 10824 bytes
SHA-256: 676aeddf0d042df5506aa913d28de18cafff5cc4cacdd3e2599259ac17830ebb