Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4d3cee30a4e9db…

MALICIOUS

PDF

95.4 KB Created: 2021-09-02 01:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8642b98157bd17d82a1b51a39403eee5 SHA-1: 1bdfd89a18c324b2cc4dbc4659ff55bb96736c10 SHA-256: fc4d3cee30a4e9db569e49f1dac87a505b7bd5417ae3f59d8a3b2e73a428e12e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/12355634113.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607630c6cdd07---jafadolirupodaf.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/kanawirowik.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/vogarorov.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mopodoluwezijiro.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/670944b2eea16e96fb257fbebc60185e/situgu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/wogufozabe.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rd2phsi997lisou2nrksgrjju0/65793476487.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/19910131042.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074303331bb8---10161629693.pdfIn PDF document text
    • http://gibisch.com/files/files/176669776.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/17550099620.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/79036436641105246ccffb66bf5a4d7f/38344961624.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bffa5f5d---40656223465.pdfIn PDF document text
    • http://hydrem.ru/images/file/76246575794.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210706020557.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jikavuwejuvovame.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/43130189698.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///23148204502.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/donesategaf.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/xijezebivubixakim.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/91553885885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=treatment+of+shortage+in+fifo+methodPDF 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_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 18140 bytes
SHA-256: a488b38de81dd7dc8437ac3e5a86c657acee3886230acef923c13562fb67bf3c
font_02_sfnt_off00015677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15677 10720 bytes
SHA-256: 89cad0ea2beaf362fe689cf82a9d670f4214f239fb1d0782834711f1a845e459

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