Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65dc75edf56d458…

MALICIOUS

PDF

82.9 KB Created: 2021-07-08 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15fe86854e0746b782915e2ff9ab218b SHA-1: 8c0ec2c4c0bfe5b0373d9ad0ad07105000e3d5a9 SHA-256: a65dc75edf56d45853a42e5ecafa2e4a4aa0b75c7af05f62c42d3daf02b7304e
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to external URLs, some of which are hosted on potentially compromised WordPress sites or use IP literals. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://christopherspubandgrille.com/userfiles/files/luxaladuxazibupeneto.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a212bc84c---lavugefimalasikisojafux.pdf
    • http://toonesk.com/upload/juman.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6550df050f---99541505929.pdf
    • https://media-get.ru/userfiles/files/sozojapivemitepakes.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e505cbfd4---35900318293.pdf
    • http://smepil.com/ckeditor/userfiles/files/ditagawolawixofejiliverej.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeaaadb682---tuvubirikukibetebizufut.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2vbkh14nq2g9np6eip95fqij34/12842027784.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/c8tndlvstalis8606o325bauol/jakitumerebazodamal.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/95821034803.pdf
    • http://gelateriacool.it/userfiles/files/forazokepu.pdf
    • http://3dtechgroup.com/uploads/image/files/22032137911.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/negilotobez.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2827cb922f044dca7f2f3b591f745d68/vumapaladiwonu.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1k8d35nm5rt0d5m9us115r1ht1/zifarupar.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f9fa8119---76341791755.pdf
    • https://bachson.net/upload/file/5567752386.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43001b301---zonivuxo.pdf
    • https://poolpoint.be/uploads/file/1973074102.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2f6eed2bf84120a9039d50f40e3d32be/19491580919.pdf
    • http://nacyc.jp/Upload/file/86185385511.pdf
    • http://teenaramainc.org/clients/875997/File/95162444921.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6571092873---wogawu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e642600af967dd81efec605d99a9c43d/xewil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rrb+study+material+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df47.bin
b0bb91ce580619d15e6864669b4258b5bb4e46d9814ca76e2e482bdf1b80f0dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 17432 bytes
font_01_sfnt_off00010c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 16792 bytes
font_02_sfnt_off00012426.bin
628b399a0dd8955f802729a24acad492a033ed2cdaf7f15e066ced7cf4d05ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 11144 bytes