Malicious PDF — malware analysis report

Static analysis result for SHA-256 b450ff9382f6bf45…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 497fad95c31e066d13219f345371db11 SHA-1: d3b24f364ddd37a38f075f5e4356fab27bb3587e SHA-256: b450ff9382f6bf45cc977b0b2f516cc17a6c0857524d9acadf9266e12ef2fd12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress upload directories. The presence of embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine rankings or distribute further malicious content, aligning with a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://drivingschool-brno.eu/files/50503819788.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6b2155e17---27737350943.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48fca04c3---pusipuv.pdfIn PDF document text
    • http://canvangdientu.com/images/file/30812730203.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ej4a6shmkgp7tp0me93qeu6j0f/wikumopuxuzikinofujasima.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wilodateresak.pdfIn PDF document text
    • http://teknis.it/userfiles/files/misaxumon.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/xovepimonesipokizexefozot.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u78dvd8rndb8588p56kdf1o53f/16453816591.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/57574639176.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85c1bf9f2---96684295559.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/1985551099.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/mevidurozuworanodibaw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609560758b14a---jekuranewopu.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/xomijizu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nisarezusogesazag.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a556e75bda4---77230474992.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/6439342780.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/rixivanonurefug.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bipowegimifasiboparusovir.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/tisifemeraru.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vlhtloll1uatbkbaltnkov7114/56298127661.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/podarurowajodomed.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/62108134315.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dp52g9fi36hbo0m6e3lvko4vi6/tatuxukajelikapixox.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e031e6cbe---zuvunifonugoxopefuminuw.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zugiwosudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=consiliere+in+asistenta+sociala+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_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 10644 bytes
SHA-256: 5f447fe75270e237f2dae23a140e1e26218e1f8affc5216e92f6f708344f950a
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 19248 bytes
SHA-256: 494d2e90e36be3858a28a3d5dcde65d107303466e99aee9286e5bb172c1d341c

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