Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd2090e1f072e24…

MALICIOUS

PDF

91.5 KB Created: 2021-08-19 03:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d3e06a9cccb7f4fa6cad5e0e6a5865a SHA-1: 36e346b1713407d9e1c342a0440c841b8274035b SHA-256: 7cd2090e1f072e24ec2591a2f1f0353b74c890311cdcfb58c9d9bbad8a782326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://floraplant.gr/FCKeditor/userimages/file/faturakelop.pdf In PDF document text
    • http://chikatere.com/Upload/files/41388633972.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c4854ae4---nobolifejerujiwimujezid.pdfIn PDF document text
    • http://epmachine.ru/d/files/vedifolaresafudefasi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6e526418---wuxujatifodowewozezib.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/83a5be7241f48b33367d429166c33fed/72952182788.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bimisufisexel.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/goredetikisifegelagevesuw.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m4u5tqlj5s44nt0a2p3ra5b30v/fusipodoxa.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/dofujadosiso.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c199b0cac---nerugodubatiwuropevonoxud.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dekurotojolizo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8460bb12a838ecfcc7371c203b158721/nugerofopilebovatuseravoj.pdfIn PDF document text
    • http://firegallery.ru/img/upload/rokawuwovovarutagofuj.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611341257f95f---34831834283.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bcfb7dbd1c47f3287b1a8ed814f4440a/dedopagiveruse.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/61126750944.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210808092135.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/mogurulesukelikakelexoxuk.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/96640178684.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d14828---fekozevukarawejizoneguloj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da79f1d178---tukinuzalafu.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/jazozazib.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/rpf716gfmbus115vd4ui1jirgf/40983103322.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/10124195226.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c09a303a---xubodatuwerukopotalilufu.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jikopivanesadamegofopuka.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160815bd3601ec---69232500177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+fix+discord+music+bot+laggingPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 17532 bytes
SHA-256: 924cb1d6453449a227af27d855ca44f742f81ded781ca884fc8949ac02fe67a7
font_03_sfnt_off000143b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 11108 bytes
SHA-256: c788d5b33402a212ad4cb7bacb25c9e861b10e3f1d61cfbbe2512cecf07e2665

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