Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33226c623dcbdb9…

MALICIOUS

PDF

93.7 KB Created: 2021-08-05 09:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48fc3a3b7ff6bf6c38fe7043909de175 SHA-1: 08a2b5ac2fee30dedb10761af8bb392529d5f2d8 SHA-256: e33226c623dcbdb9fab35a7bce0df11e592f60c7a06ef5a1b96fc4f201201272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains and utilize formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+solve+compound+interest+daily PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbd7d2ba0---31068746185.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f1bd47bd---82175172755.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/82182418052.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3468ee9b3d---kepaxajofasazoge.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/91350457211.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322056e382---kelugigib.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/9089123348.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tonerivawotimil.pdfIn PDF document text
    • http://brlairport.com/images/file/44493502230.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089542c94155---kotigu.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/fusozijifim.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090fddd1fbf8---mejisorubufexovesopunebo.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/rijerokagesasepo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10f460a9f8953348aa058aabba571cce/17641043564.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210803_002803.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/bebar.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/dejinisopejuzezalelefipiw.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160787ef298d8d---fobinuzinizo.pdfIn PDF document text
    • http://metallpress.info/files/kajuxodazabidedujejipumar.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/96a2602ff083a3d003b26f191a736a03/nazapapolozanipobi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8291edd8---40676834088.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160beb19d761b9---21360170416.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ac263b94---rabulunuvifudaveliwoz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c3b5ec70e03436f86f29ba345a17e8fd/fidud.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079d10f955d6---71769641429.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_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 17632 bytes
SHA-256: 38f424f489d9e22f5d3baab7defe41deea3ac5c6ca309b4608001886d0d41ef5
font_02_sfnt_off00014f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F57 11032 bytes
SHA-256: 2a1098bc266079d04ae8398b96fdf9bcb9c99847f17828b496c5326ce29a7180

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