Malicious PDF — malware analysis report

Static analysis result for SHA-256 2452952bb418c272…

MALICIOUS

PDF

347.3 KB Created: 2021-08-12 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a8c438238ec03ec28bcb3bafd628336 SHA-1: bc9582786e059b64dbd75edd835ea505eea411f1 SHA-256: 2452952bb418c272ff1430d0dd259b0fbc37b2643cf3ec2d3606b85ad7ab78bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the detection of a 'link farm' pointing to compromised CMS uploads strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

Heuristics 5

  • 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.
  • 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://classykitchen.pl/web/uploads/files/wafekonaxuderu.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071695c009db---zegerosajonerepufexe.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/putazunanivuguwodeb.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ir8ggt2s236dp6ngef94lbr212/pafowularekegerizidusimi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/52113441238.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcc623984---ronazuzipedavojakufige.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf4c33331---56245749791.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/legizezowutolo.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/36097142747.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650385d136---58314401573.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cc7bed43d045ac631845a6318f59abea/gavafamajipizunuzofegigi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ce9db73ade6229ba635c637ddf377d21/retadulosurojenukuwibudul.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f366025ee3---dexovelidapobowiwa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b6b50341ee3c4a02d40afe8332715033/fikofim.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4c601ecc5510e8200bceabdfd4372b6b/51638836329.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/29574764293.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bf51ae07---felerebawel.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075327ae95a4---varotuzirulijixulitam.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/icpvpr41ufvecnumqk5mis8rl0/renavaziker.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65423613647.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa0c52db6---41568404379.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c9436a03---rikejusasosumurafuvidip.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e73a98e4583---34683504777.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9d7f8e12f17db4d0e6dbce00829adaea/84160387728.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///50949742781.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd02a52071---7874194972.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f702eaab2f---gibajenunovexajakazonikub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=business+communication+process+and+product+9th+edition+mary+ellen+guffeyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F56C 11504 bytes
SHA-256: b79e48dbabb02df1786e239b4f52e218dfdb0865101f4c75c60460a23daafeeb
font_01_sfnt_off00051051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51051 20616 bytes
SHA-256: 14b9cdd8eefa6eb2390eec3ea3dd73f48055320dfe8b4b47db43d6902cac8e14
font_02_sfnt_off000545fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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