Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec54d6185b03f06e…

MALICIOUS

PDF

90.5 KB Created: 2021-07-08 22:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c3d50e81f1af61652e4d65be065a998a SHA-1: 02959219ccd3bc10b664096b3122f4f9e48bcd9c SHA-256: ec54d6185b03f06ecc66cca75d86661d05f12514ae347d88b22b81f2f5b9ef67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://semineebrasov.ro/printuri-fi/files/sudanani.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3f63d001a10fa575e75a15519e681d47/buxivetoduv.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lalojonigolatodomuxovar.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db5078963c---92312312487.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/65032389468.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/16866550330.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73040403859.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080443cacb81---fevibowexexutogel.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c126c276c81---simopitug.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f06636bfc872f5d3c95c902632fb93e4/sogegaluvob.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdc658feb---zesexasewur.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad1d10acd---volopewafapemigizakure.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/62667969856.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/64237806866.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa569a8dde---69647547796.pdfIn PDF document text
    • http://hopkim.vn/upload/files/bulazew.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609846b067cdb---rokumefopoluziziwazarew.pdfIn PDF document text
    • https://mszukam.pl/dat//file/52740238557.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/132d9f7b7ab1c634a9cc056f5b04d5cf/80752901608.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/43f76dcf23a8c7653e5701e8376cd056/16884362582.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/12040896286.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081618261ef3---momadozozenilevuxijetugi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba743b52---jekose.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1c905c2679ea971d4c2899a751db4d2/2634604247.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bce36a158---zapovoniwuwox.pdfIn PDF document text
    • http://mousike.it/img_ins/files/99364417107.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c118b104baa---buxibikijumanabum.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1c6i4i26f1bl9n870hgdm5h3h4/voserogedojorejejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=5+letter+word+2nd+and+3rd+letter+pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16460 bytes
SHA-256: e42380c1dd72b35290dc3701f927e131c18568622b293787b85a90ae0c9a1463
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 17332 bytes
SHA-256: 48e785aef8a46c5922d77133ecede2346aaa26d378700e59ef6a3417f3914469
font_02_sfnt_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 10540 bytes
SHA-256: 626805e455d7c2780a0226f34740e8abe686ce905c634fa190b9e244924d8c5c

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