Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c970a6e7712977…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 15:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d5a3ec417470efdff3e912e427b9758 SHA-1: 99724aae209509c921e1ee406d283b2ffab1d892 SHA-256: d6c970a6e77129776f2fd8e9dad1f47e7f6c140a41190898ff4846ef5403dddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=mortal+kombat+reboot+johnny+cage PDF link annotation
    • https://ikincielinmak.com/upload/ckfinder/files/pakugamew.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/91215034b046a16273173fee92a7d581/89609407936.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/wimob.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6bf91580---47103643450.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/6033374036.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/15611458052.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/zilewu.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/kamivuradavu.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88317552995.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109020928455949.pdfIn PDF document text
    • https://etimes.mn/uploads/files/favoxa.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/segelo.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2003854802.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/luvipidodumepepuzazufuku.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/578270357.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/40683460429.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/59033257881.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/welitukatasebizolupisa.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/gofaf.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/37988263593.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/degawi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311648ab5d4---51912718650.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4bfc70df6a47cef0336ecd5584507dea/47113249595.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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 19144 bytes
SHA-256: 376a755706a5f0067a488388df960a4f46ced37ca9836a055d872aab3524fa25
font_02_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 10888 bytes
SHA-256: 55f44781aa819090b3ee8113d93b6d02150fd8cd82e5e04c69e7741a0cea5e06