Malicious PDF — malware analysis report

Static analysis result for SHA-256 defe79c3c09efca9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c85235fe413eeef865da43df5ff1678 SHA-1: cecd729b93f0a3b2cee947d28aae63598575537c SHA-256: defe79c3c09efca9b6d72ea219cd5eaa8738a3401ae16c8ce99fdc2b40453763
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress installations. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=text+annotation+services PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a414ba78161---pizelilojokovapurogorake.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b3c4d460---24586362086.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h50rqni05t9vbik8lmndh66kp4/61149119329.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9b9d8c124a4fb9d9a2b460a2221c171/ramin.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80ed4dfcd---19520390446.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9debe9080d55853f36ec3034db0c1f8f/rokivewisabaxuvow.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/45279860504.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca4914911---8410714076.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/kavimogotadovedafit.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qg1uk9c7l32pgjqbq81nc6btgt/denimunolarukowevivogeten.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52d982ebd---dimebu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610547ba10735---88168728735.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec37cb15b---12126905243.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/47213498983.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kiseduxekagagidovaxagut.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/karazuvegeritezixilibo.pdfIn PDF document text
    • https://irantruck.ir/data/file/jowagaxi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2585e38e27413655cd4372541cdd9140/xexulezalatelemekire.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160acaeef143dc---15901442876.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vutijajerolaked.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a54c5cc3beff57978f4d56b4cbfe6de0/64772117308.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d016ab497162b3491231b0bf5c9b70fd/vifunanuluv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c1afd0c4487dcfb48ea0a89f4b9e553c/25418580515.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16127bc0312e8a---wevusinipoliwakuwux.pdfIn PDF document text
    • 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10308 bytes
SHA-256: bdda9a4fbd1a68c1140d786ce03c6e507366efac19e7383fe4a001fba3cbe874
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 18552 bytes
SHA-256: 2879b97933df4ed2d93921671bed5dbc9fac122920f545b718083ae131ce4cad

Open this report in the interactive analyzer, or submit your own file for analysis.