Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63f2952d2e46c3e…

MALICIOUS

PDF

74.3 KB Created: 2021-08-14 00:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78e1c6adc383ff50469c3550e7d58356 SHA-1: 2aef10e0b259f9cb45e9a7ebd447f9d9b94dd440 SHA-256: c63f2952d2e46c3e77ecd7c447d93bcd2866c3ed373fb07171e67f31e07b8a50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, which likely serve as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5899dcd74f---nageburapuwepozetur.pdf In PDF document text
    • http://abwingsbuffalo.com/uploads/files/tevebiki.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2882f222---ditimikigumididaf.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/33950440484.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607030ace1aaa---folebosomovavuri.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c93110137---70837186127.pdfIn PDF document text
    • https://ghnservizi.com/file/60432105636.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a91a699a---85806712579.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e3addf8178d4861531ff77e98e8f2b9d/bipifibaxidot.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9e2c63a2---61466840573.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/tagubejelojazovu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2827d56d59889a419fed6bcc1eb5df38/74129494536.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xanunoxivap.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc972ea7e6---dafilupotibenudomu.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/xaminamazojiwadu.pdfIn PDF document text
    • https://ms01bet.com/contents//files/53322368589.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2bd25ac2f---86334830256.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac42135df2---gurujulena.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0b88c54---nodegavinunuf.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/67c4f216cd3ab0023ba4b9ad4380d604/42481172793.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/c42a962e1b426ebf59cb930f493bbcea/zewivezepenuzajuw.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/62763723948.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6954496b2527b0b0f920561bc8684347/4766685694.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c1d18e4117e1006eee411fc2d0c5fdd4/tevotedogezilimaratam.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0f57500b---68710323942.pdfIn PDF document text
    • https://dm288.rs/slicice/file/pemuravajejodulis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=imprimibles+tarjetas+del+abecedario+para+imprimir+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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16164 bytes
SHA-256: 63ca7b9c3042b0b2879b15acd75abb594989c60129b2bc729ad2df9e7391f51d
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10900 bytes
SHA-256: 1c55a7b8a526fd7a927cb29c35b0e5919c1493fcf958f5224b743b876dc10b40

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