Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe237935b7f99c24…

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16d1e2d0023189672497425bf957bd9e SHA-1: 18b64e0e472b2f5f2c7e4df02c85abd6a559e34f SHA-256: fe237935b7f99c24aecf28688c55d79f87284848efb688c6064d81b84025f66b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories on various domains. These links likely lead to further malicious documents or phishing content, indicating a distribution mechanism for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://truckforceone.eu/upload/editor/file/lodisejidisisesavudorap.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4310e76e7702205f6068883bf81dcbe4/fasuxar.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3abec920788a5a05fabf94d7eaaa4fc/36509409644.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a998721dbd---40252663504.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f8590eef71958e38f4f2e27e357f729c/riwabasuluxazirepuz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160951010a5ae6---funapodivexibogajuzosa.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/139k5u9q3jvs8ptamql705pgfq/84349872882.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/nozixamoremoxejudoz.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48239488844.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6112b7f44---babimumagijerugizalirexag.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/10886063186.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/66721970257.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59581454593.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/66882450992.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc55105444e---50089151593.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a776d0108---1519510988.pdfIn PDF document text
    • https://lesura.net/userfiles/file/11059220155.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d98756a---8616068194.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/srd0lage3ov46g5f6c2iuuc1je/pezarenogovana.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vefazigamegelawovutezeruk.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095990c643b1---57892326623.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb2a942e6---84018270053.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fee1f9612a6---81073314401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+light+pilot+light+on+amana+ovenPDF 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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17572 bytes
SHA-256: 244ca76949c30e8ea9de2be9e32b064b4cb8d0c3de844d87a034c1619fb23404
font_01_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10576 bytes
SHA-256: 632a5b3b8b767603233391db86ea05020529f1b049d82dba0e6ddf3fdabdce49
font_02_sfnt_off00013be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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