Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac3e8cd4958efb3…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 07:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c93a2591ecd03bfd79b9a7428ae7bdf9 SHA-1: 676b914acca709eb55732ad7ed5c8a38abb4a5d8 SHA-256: 0ac3e8cd4958efb3d785c1351a58b8b2f1d03aa4c1e4a7406b7ccc8603c2b9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://airtelco.com/data/users/_/email/files/veludelup.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8dhfc0b2g20l9p7g3rg3isjg4f/pobiraxirikukezanogo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089c09aaa1c2---32572284981.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/solujulakovadavajixi.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/43664306859.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/26669483415.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d31b03593301c719666fb81f6a4fe283/gigexal.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/koreradugejofonesox.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae920bbd---15321934836.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268cb2e76c---fuvisopemabigavafil.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/cml70am85qfh4se6oohernrhc9/jakipovakuko.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f08e2a42---xofibozoxisi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609467236b651---xerurubiwajexipit.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5ad55216c63665971f26b6ddb4e0bda8/6133337735.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162251145352.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d51dcb1a887ec9af56e1486090682c8f/7343969556.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zofelukewolikizifagu.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/pafexowusovupupogukon.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b04901d6---nesuwupufub.pdfIn PDF document text
    • http://strandedtattoo.net/file/gabajavonaxipetafepe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44f8b3cf5---nodukupadiduletalazavuvi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c259e72e---95786752968.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607002a6519d2---33822082825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+office+bird+funeral+songPDF 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_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 16980 bytes
SHA-256: 25ab2c49ee8d0f5f0d392f475b5cca7d4ca9090c686b1a65705c3a0ca7fbb04d
font_02_sfnt_off000153ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EA 10860 bytes
SHA-256: e83fc727b12116e685553cc60c1330a647dc14fef5aad62544718ff5ae163a7e

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