Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f1d0cd38013660…

MALICIOUS

PDF

82.3 KB Created: 2021-08-26 19:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db47c86ed32b5c2763a3e41164435421 SHA-1: 5f8985c261e14cb9caabf0b740cacba3d4048403 SHA-256: 51f1d0cd3801366064949e2d6b5f5b574d0b590605b6de5799cbf5b0adbd17df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drproperty.in/userfiles/file/batoki.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a18e215eaf---22884993088.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/52705480848.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce448a7266b---munogerapujudifipijotejil.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaad46626---33785968504.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///gigureripiraso.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/nibutopibonevivudip.pdfIn PDF document text
    • http://epicridesnepal.com/files/24765465218.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8767088b18---ribababisonu.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/98942194129.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/7138508949.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/79110864202.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bf9839484681261db642485911bab922/xumodebowifukatelega.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/wijumatijixuzoro.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/4901147181.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/97899824643.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xedixez.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/34771903634.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/22303608287.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lusumegosavolepogobafali.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74f6b8fab---15181505687.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611720fc764e1---82744039846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=back+pain+middle+right+side+hurts+to+breathePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde33d5cd26---39500325538.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 15804 bytes
SHA-256: ce703c76aea31df34f84e2bebdf86986a6fa4815d404339fda001e604a91644f
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 11344 bytes
SHA-256: 9394e4041ac1a1f53c664f379ff40261c9dc3c3ca8ae8a7bdd878593841bd959

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