Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47b453908a17310…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 00:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e12839c26df4c2cf43025a4f1b072f0 SHA-1: e4b3cef392749d3a52bbe69e870e71ce139a9ac3 SHA-256: b47b453908a17310003e7e79c950935d7bfcfa0ed132b69fb1441902d19c755d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of compromised CMS upload links further suggests a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+cast+from+my+phone+to+tv PDF link annotation
    • http://temple.mo/userfiles/file/83226814707.pdfIn PDF document text
    • http://innotack.com/userfiles/files/30302452010.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vijakawikiposapuloze.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d8b1d5f3---dikuzosazegugu.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/81019370406.pdfIn PDF document text
    • https://tempegaring.com/contents/files/tinusenolozopile.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sufarewifolosubimovi.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/bojepubow.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/21836768147.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147087f8c729---29105079144.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vorakakuv.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/25422644537.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/88236931133.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5a965a07---xubufuwiwijojon.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109171744087735.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/fovejemowonirakiten.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145d80e27fc3---dixotoneselikizawobipivam.pdfIn PDF document text
    • https://arerp.kr/data/file///73336979893.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/naxolilemumeni.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pitemas.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/wugakasezule.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/68596967754.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/luxonalixateviku.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/43009492303.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/5838864517.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 10864 bytes
SHA-256: fdba381aca29363526d965049c05cc83fe1b3fb1cb16ff1056ab26f797fcda5f
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 19756 bytes
SHA-256: ef61e37bf8b51d1ea35d59fe174ed961ee21ba7a4dea6c1d522bec1a7f1e3408

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