Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f8e59ad5e227b0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 02:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83b0b05b8bdd80d8512c9b9d2ede1b09 SHA-1: 45e0275b1f0c0f515e748c2d05158d39abb6ba67 SHA-256: a7f8e59ad5e227b005f8d52a2a0407c45aa2f313b81dc4b739a2b383e5427e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a phishing or link farm attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://centralgiving.com/media/userfiles/file/9197625582.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/xumotumatuzuwizefabi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fnlr00ca7t47jfle1748igpj7b/75562237283.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f6a22a84c8541027239dac8dfabc80c1/98939532281.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/7595896955.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/firenomojuvobidabudutizo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fiwenozemav.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xowekopeba.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/lixiwexijakemene.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gepebemidevirumagi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gm2eke12cjdsi31q1l1j5pao5n/gibulodepafufuzilupupaxo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607987147fbea---39199248155.pdfIn PDF document text
    • https://actorconseil.com/files/file/futoputanitazokigo.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/47033901389.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58017a6d2---kotolulome.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/tilidebixuradagu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3060a3120---89497312828.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/12263825412.pdfIn PDF document text
    • http://thepducphat.com/upload/files/49191229135.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/15614074597.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e2f79031faa---31530504119.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/dajijejazotiremizekavawot.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6c78ba9fa160ea209a6f671e9a165f6d/33494021190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=definition+of+records+management+pdfPDF 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_off0000bb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 15008 bytes
SHA-256: 4039aea0a8e5cf3ed13c59e0bddc21c48158016034e02855618cfc428fd3bed4
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 10916 bytes
SHA-256: 4eb6a8f82aae08e9d8dd120781db09f464d80c4ed36476bbaf089ed64732c3aa

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