Malicious PDF — malware analysis report

Static analysis result for SHA-256 83696666b6f4aba1…

MALICIOUS

PDF

81.1 KB Created: 2021-07-24 20:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7782baa69b99d9a334898635a9d70ec SHA-1: 9dc6926a58c55b4735e9841db9bbc59af0defe39 SHA-256: 83696666b6f4aba19b960cafecc37118068e3d40227e242e10941e8a62761264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure suggests a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607816667c6a9---fubarapisedi.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/77616463679.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/h7u3o6g1hfie5mla4s9gnfn7f1/piferu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/54dd66e250b83c4f634c0e5f61c45b30/19017814047.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pslub7o74r5n8e6svmha8o41ou/91339910213.pdfIn PDF document text
    • https://daismene.it/file/lekaxudevukuvanamusunadal.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82fd35c3f---45590197483.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/welimobaj.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/72982677875.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/135a8c27e5be9de69b4d3f29e4f1d581/gejovuvavomuratuzetewes.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/63182143681.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797aabd3a0d---42767847441.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe49ac415---20692766922.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lusigewazemipirepik.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/aeb36beb1131879a92c6234f172375cd/31699537431.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/a5cm6qa7g4tk58vfds8co7i9e5/xinit.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23171a18e2---nifabulaligefutaran.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kebametebis.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607851630345c---55593234734.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/sibuxesalupifo.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/19596853570.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/65292262267.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/xamurepovu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfa3a2317d---78737835358.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9b3dbb75---kodataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=propel+star+wars+x-wing+battling+quadcopter+dronePDF 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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 17256 bytes
SHA-256: eadc4f58ba5f7ca75f2c2e871c260b7a5dabe9c7bea80a11d258679a53633380
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 11300 bytes
SHA-256: 4e01fd92e1a7240f7b602d22771d17a748686ae0af43d8096101892be94040f7
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1