Malicious PDF — malware analysis report

Static analysis result for SHA-256 e680d65d819020c3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 20:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f33eb239b9a3568ab9b6c8b384e6b037 SHA-1: 187fb7783804f5f994016c4c17a872ed4449bdee SHA-256: e680d65d819020c39de8ef70fcd98abf3d17e87d17d1e3c04a6e14d10aefa62a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The PDF also functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or malware downloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=math+sl+ia+statistics+example PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dclnagl08ls27nsja481rubsos/xazotojidilizuga.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492c49d4d65---gedutodewurudobaxubizenab.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/74162323831.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wuzidexemudunagaveniruf.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff72d97129---jagupegewik.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/2921450798.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/monil.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16324784072322.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/80131155837.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46547491774808d0e534b4acab94a3aa/tisekenafowukunela.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133404084a7b---jojiputiwamufopevosapole.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/54067745615.pdfIn PDF document text
    • http://keitbg.com/images/files/nibifi.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/30739083975.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/12427934613.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/moziwatanadel.pdfIn PDF document text
    • https://attack.lt/images/files/rinorixevata.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/93654582883.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wumiwomunimoli.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/mexeg.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/72303334649.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/11826777836.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/32511645347.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/losexopiduz.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/37680008695.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/vutofumufonolip.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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 18124 bytes
SHA-256: 9bc75090c542adbb51d57230839daaf0a318e5bac56f0f27121254fbf9e777b1
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10412 bytes
SHA-256: 94e3fccc19bd88235b4044096c1a2d4940bf98e45f437a7ba5a7f9eb2176299a

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