Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a271ae499385ac…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 11:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 748c74bfd663d44b91812c8a0188a446 SHA-1: a36020702d086fe55739c2b48dc7db03b8be1dcc SHA-256: 89a271ae499385aca92a57a4dc4f3a92fac9892b0d957eb21e6d15bea5554935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://lepetitjaunais.com/userfiles/file/57232337927.pdf In PDF document text
    • https://reformedgeneration.com/userfiles/file/jafozoxixagewelewumax.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138577ae5af7---zibogugore.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/46257243949.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f3e9ef36---nadadosowin.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202193949338154.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372fb2b00b4---juvenivowek.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/sosapigilisilanukifib.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/muxefevedixajerasolojuxu.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/34423646618.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd4d7f3c8---papelijabe.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/32662196732.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rukefewaxetadodarutex.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/ropesetot.pdfIn PDF document text
    • http://dentherapia.hu/files/file/paguwodezet.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gidazeziwofimagewawaf.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907213209.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/79069313735.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/bazukowisorojosobuzarefuv.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/dupowalavegixukalagas.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/libov.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/boparewo.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/96797587731.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wubamapujusisujolomapusak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=google+android+color+palettePDF 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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 10560 bytes
SHA-256: 78df308d3e365b20daf18ffa016a739935662e382909dddef7e2c68808d14b88
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 16800 bytes
SHA-256: cceea90d5495823baea5f703dff2ffa5ecd14b61932ccb7e15c55449252da8ab
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1