Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ad1a5e76f88b16…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 23:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7b00f372bbfea96319d1e0e9c3efc19 SHA-1: a9dc1f8dc02d5fffc2c5ecad3e01967a582aaa19 SHA-256: 21ad1a5e76f88b166096ce44f6e6cca2cb3dac6f8893030dcdbfaf9d9d371d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple external URLs, many of which host other PDF files. This pattern is commonly used for phishing or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gardensyellowcab.com/admin/images/file/49379031925.pdf In PDF document text
    • http://studionegrelli.it/userfiles/files/51424847961.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/46235303498.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/49983358871.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/38022411107.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d92b6dbf2---90535045622.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/filudepegoku.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jorekewa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c4bf9d86531ff8ed7e0735b4eb6df3f5/vomiruvulozisejidubuz.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/52605128761.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/97784851362.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/7005238776.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/5399692934.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613497039ba95---36351471581.pdfIn PDF document text
    • http://princeverma.in/uploads/files/pabebubalozon.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/13290974429.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/74690046923.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/gumukadexepabafadunexow.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/puwidegojax.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/mobovegijififik.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jogusurazi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667420b7ed---tozitebenoza.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/widirikemiwozebamideles.pdfIn PDF document text
    • http://canvangdientu.com/images/file/35649472767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=comparison+exercises+pdfPDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10772 bytes
SHA-256: 455e165ecc693149e32716f307db21f5850cc497cc2642ca7456a5d82dc235c5
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 18620 bytes
SHA-256: 48c9c52b3081693af86cc34725c4035dda941177e9269e2dae89e0037b1e2a1c

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