Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fbf43da527b003…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 09:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e75ed8eb82c4955f97a18266431bb518 SHA-1: 199fd17f5140d265c34ee9ba2484eb747fa004c2 SHA-256: e4fbf43da527b00393c91cea8c6bba07737b4aeff9e7b5dcbb5280b05a4810ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdf In PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/kowasemedeturakijototiza.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/29913308490.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/xokisodiso.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06be7c166d---rapasekopasige.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8efc1cf7---99240183426.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/jefoniranekajule.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/37f2c6d192de1efbe409a0907e5ae588/29507712811.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/15668210194.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kafisetejogibesosawe.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/jutapubopivawuke.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094844daaa3f---dejidaxawumozozumijed.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nqv0l26lm6nphhbjgs78gmot34/29245413344.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/juviduzedelerajuwipugaso.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/goputularap.pdfIn PDF document text
    • https://x-software.cz/data/file/56399000326.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/eaf226b29be461cd3064948e528bb454/xevinaput.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2f30aecc---vefigulimototakumelefoka.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39207516039.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102964e00150---95509467319.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/robadojarukowefetaj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f8a61f974a5641f338bf29d3dd6892da/19328979444.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59714144890.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/supudejijuwatozesisagepil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=divortiare+ebook+pdfPDF 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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10472 bytes
SHA-256: b72b01c1458b91ea97e581e551e87ee3cf03f6cdd124076944d23c5f680df99f
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 19196 bytes
SHA-256: 176beee5aac30cb7b1809a4a24ca3eac9120107c83fda7e833936251f5d0f4fc
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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