Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3c8708d340d0cc…

MALICIOUS

PDF

77.1 KB Created: 2021-07-13 19:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e5bcf0301068d2601fd066c8812de07 SHA-1: 4059d5f5c3b499171f269b64f03dca481b136ee7 SHA-256: 1b3c8708d340d0ccd1c6f98c9c0ad57608f085f8f158609a1d06b961e9fc8f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is designed to lure users to malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://philabc.ru/uplcv?utm_term=seether+official+website PDF link annotation
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/sgmh5hh03uons970l38scdk4pt/gopuvizuzazufowofexoxuz.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/54671042441.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160790d6c43556---toxujuto.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/notazodefifudakipudidile.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h6c9m4mq8r4dts24i0qaujjae6/44471449193.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/pivebijulegolebedulemir.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lejot.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/70540550140.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085680e25ccb---suxirafuvinepuvosomuromu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/56471406109.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/66f0fsjq131b2a8f8e56n5nih3/56137294615.pdfIn PDF document text
    • http://prosquash.by/data/15958306885.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/9276422217.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0b6c93fe---69357753562.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vujesuwa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4cf88f64---kiwazibegeban.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f30e0433---niriwogik.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/72313779401.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/todijujegesejotegesafa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5fmaka26lt0ukbe0seviq33t27/gofinaretekenajedobif.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc97b57c4d---98725417403.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d234f9fd---jivuluzigirava.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/3164756821.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/29592170249.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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10632 bytes
SHA-256: e2cd5123fad01f67fa512d4aff518347677692cbe8414594d788e5af8c5dffca
font_02_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 17264 bytes
SHA-256: f2250abd2d8640e07071ab2e1da53ec71eef5a2ae368685b16eb848323a3ca1f

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