Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ef5c45aa7105a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 09:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e9d6ef4fb9d9c8af43f3688f5ab4992 SHA-1: 54c1c57f54588363e60aa1a72a121363cf7b1ecc SHA-256: 624ef5c45aa7105af7dd4da6b774753437468c1a1919ab4e9daafff7bfc18f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bharatiyabhashaparishad.org/ckfinder/userfiles/files/95231815509.pdf In PDF document text
    • https://okazdedziecko.pl/_files/Media/file/91634799657.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608337fc63640---wavolowo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pepebuxevuxarekobo.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/65149924465.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71634565229.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/kobanolanukubis.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210723080131.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108191819162710.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/49837427863.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/vezafowex.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cf97a6e7a815dcf9c192d64f4e066498/gerunawufuteduneneme.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/3907702268.pdfIn PDF document text
    • https://eventaipei.com/upload/files/66940686619.pdfIn PDF document text
    • https://banghenails.com/upload/file/87660000375.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16262367213007.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/wemipizavaxa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea18bb3fa---55093952624.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/rbt24e7hnhptubm5aovj575etm/81253722407.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/sapipotapoze.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4d6e7f1155861e67801e33bf7d6ded5f/kilofomokubim.pdfIn PDF document text
    • https://mfdesign.hu/files/file/9360675288.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/rimawajanuvipepubijit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tenses+of+verbs+worksheets+for+high+schoolPDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 10800 bytes
SHA-256: d766da445cb958849c306343c38d2ecdd0a2300ec1cb34d4a29c9f040cf21c3e
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 17812 bytes
SHA-256: ac78fada20013e2a4d693f57f85f4d64c21240c950f6f76e732cea5c2e6bf527
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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