Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca0df5c711df7dc…

MALICIOUS

PDF

72.1 KB Created: 2021-10-01 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ab7b74569b00b55981a35c440ab9b47 SHA-1: f3c778ac0d1b5c52c9b843e3523780fdf21e5071 SHA-256: cca0df5c711df7dcdcf58c035ab120dd47fcb86e7b7ccd78817c388e1afc09fa
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. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=hello+stranger+the+movie+eng+sub PDF link annotation
    • http://insuralead.com/userfiles/file/38627150742.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/88713884959.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c5a2d42f559c56b5c8fd902f932594e/34547887201.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/86777439192.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909035626874674.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/rugaruvizovu.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/99457752401.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/75549986379.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/83340953546.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/52765581171.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/23797110187.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fac758d01---jirakefuzawewewilarovu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f243144c4---9611280920.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/gamasaze.pdfIn PDF document text
    • http://konberdbio.com/upload/files/1321440881.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/34678635887.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210926225447_rt3fbo.pdfIn PDF document text
    • http://fittbikese.hu/files/file/pininopalimopebopibapen.pdfIn PDF document text
    • https://eetravel.net/file/58253164193.pdfIn PDF document text
    • https://titishop.co/upload/files/muvevil.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/pulidameb.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142958bae855---nafumaxaporobe.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/255f096c9e3e555b8866425d0bd85bb5/36292823882.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/tapasesujipedipodikig.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/44607654416.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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 10852 bytes
SHA-256: 83c8391ed2b9db5fe06d9a75e0788363c9deb6461b058f646099473fd168df32
font_01_sfnt_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 17884 bytes
SHA-256: 0b7df0a1108de97a7660dedc1e104098765226033d1a85fa3c9ba6e78dddf7dd
font_02_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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