Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0a3452c56f2ffc…

MALICIOUS

PDF

93.5 KB Created: 2021-07-13 19:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fa4a9f220b19e41ec52a0aee974d127 SHA-1: 0ad19f1283bcf1d733e198da3b08e5ea4e84a816 SHA-256: ab0a3452c56f2ffc2fb02d3f53f2cfcf5afcbf077b0d43422a971d957846fa13
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links suggest it acts as a lure to redirect users to potentially harmful content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=class+6+science+chapter+1+extra+questions+and+answers PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f7a43c1f13bcac06b24abd3d6dcbe426/woxeseruleg.pdfIn PDF document text
    • http://ccsl.asia/files/guzogazeweponogajadutiz.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/836464661c50f5e2c16d816d35d22a89/tigudifubutumujanorolape.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73335b97a0---38718850378.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/9337598664.pdfIn PDF document text
    • https://kuepancong.com/contents//files/safadimamekanin.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3657e4dc20---3203624200.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c368738139f---fidexewududitulogo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jupegokafugolalu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160723a9d584ed---nixixeko.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a13934258---3305728581.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a5a3324a---wejupub.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160915de343531---xivonipokaxadinuwe.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dijenoleledutumuk.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/45018171094.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rf1rgf37h1dfuo2ei4om7rsek8/vefumudizi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/beluletavakonug.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fb4fd8c77e0b3307191b57d9eb626dcb/tuxudononulezivukupem.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897be97d0b5---zixudobex.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tawep.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/78144130231.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/81956343383.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jebolu.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_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 18504 bytes
SHA-256: f3e5545ec55738564bc3a0abeeecb9fca4b441cc6f9b2f200fbc5bcd16a1b323
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 11296 bytes
SHA-256: 2e9287b0d5f8e84b8cb308b7805a623a82f512b2d33b87f54b7422fa3160e4b5