Malicious PDF — malware analysis report

Static analysis result for SHA-256 2482501ff643b50e…

MALICIOUS

PDF

99.0 KB Created: 2021-07-01 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2394e73e4f4f268862e3d911aa851e01 SHA-1: 0c7fd579ec75c33815da2e7d7cee63e8fa9e62b8 SHA-256: 2482501ff643b50ea32afca44648aaa35ee1d8103baa06851d1761d84f29093f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://dientrotiendathc.com/media/ftp/file/xewabebejakefa.pdf In PDF document text
    • http://yoron.net/up/files/5169493436.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f5f4d2d7a11877f346857b86e1fe626f/femaxalonobavakopixuzoj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7045b665df---vozixid.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/buzosaturosojaxujiju.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/bawebumunugofarapotadigez.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fcd6ca0f67cfd92dd60b3d431d3d6c4a/84289901450.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3b1bba9a550c60cbb46934c549982a3d/81821804014.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5275b2c670037ae339fd8943bb973118/paxub.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b132e9ea06---tatijim.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/22162124935.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s274ri1qdvprt356g958omp1rm/birosisuverofopenimasova.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/69n8a5n8prr63vb7do3g9bg7hj/dagamixilasago.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7bfbc2d02d2bd0cf8f83ad0b7174fcd1/85137967088.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160851e04428c3---70020024269.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160946d5a049f3---20078866197.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bosebidedejagubitur.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9b3223237daea8f5cdee6d17beebd311/dipar.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/33208723366.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6751654b35e833c1dcb8dbab0d39dbb4/38905446858.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/1264082432.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dpgqfjm104mlgg94cb79l1e0s6/56317751911.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083756605b9a---sebulomiruxalexafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=indesign+hyperlink+url+is+not+availablePDF 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_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 18464 bytes
SHA-256: 80418850d73aa862dc9927390c1dc76600e41727801609a1087b5a38e3891250
font_01_sfnt_off00014b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16345 11132 bytes
SHA-256: 8f6ed977800a504fd814476530e8801943189117060f0be4bec8345e3b7ea683

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