Malicious PDF — malware analysis report

Static analysis result for SHA-256 4288189914c52f31…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 01:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0a54bf3757497698883878aa991e4a4 SHA-1: fadf36f9c6e71ccdc982be3b827ff02dbea2894b SHA-256: 4288189914c52f319fd40f0fc847d5efb13b47e348eae0b4264723e097ff29d5
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, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of hosting and linking to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tagoproperties.com/ckfinder/userfiles/files/donub.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6c6b0d0f538b79f5ed032378263497cb/rajagutoj.pdfIn PDF document text
    • http://tianfonmm.com/d/files/morepenuzafasademuvole.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/23785726914.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160accf5b11e71---74826321113.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nibopitapoputi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210828091922.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59871eb53---mexux.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/53027861699.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c770b3f2---xopuridimukekiruboge.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nadid.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2e65183a4bb737bec751c21066117f26/62727843619.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/mezodogitevijojubogeza.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f8490db6c0c7a69be1b711e2117acb7e/ripofugomoruve.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33637c969493a14f7204407cb145df0a/tedatovekefakimadimoveti.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/xusax.pdfIn PDF document text
    • http://w-mill.jp/images/file/76466740715.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kukakimijozid.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b41fd774b---nigogileb.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6232bac36---widij.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160767c87a91cd---radigekofuxirujaweriwuvip.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/tugatujurazubivasugini.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49f80dcd6---vurepagefuzigifimelemev.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/902688400.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3bd18a309036f41d4b2e8a69a30faa2c/simebolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=guide+de+developpement+personnel+pdfPDF 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 18848 bytes
SHA-256: 7bd851ea1dbcf5215f9ac4e1d6d3993840efd68ca1568e53194ba95b0556d034
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10700 bytes
SHA-256: 93fbbe64cd4ccfd7f623e9d54262201d18ab52317b61271decbe1b8801fe6b4b