Malicious PDF — malware analysis report

Static analysis result for SHA-256 917abd1932c8e014…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 11:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d0c29b432c4a2e28772e284370140a5c SHA-1: 439f905dfbaa5c2f5fafa67569763cd4f2b0f74a SHA-256: 917abd1932c8e014cd08b5d95c4572e51980e8dc66179c50b8aca03719db56c7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://webmenuplus.com/images/file/bewobafanudemadif.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094d8aabbd0d---kelejupu.pdfIn PDF document text
    • http://scro.ru/pic/file/46864418920.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/70766161170.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/81051383954.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2e2d670b---22117563324.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/34229942470.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/tekiwisokelofafudusudaxug.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8a343afddfb247dc899a4fb22d2da8c1/78337196951.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/sabidiwowuzoku.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/91474985464.pdfIn PDF document text
    • http://trevorhannant.com/91666430693.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/35082909615.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fc0d6f03a5427616324c478bd6287fa8/simubuguw.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/34288610982.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/jikojumejadebobutepisuw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100f0d3d3c53---geripubumizulutunun.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/fewodilowebuwari.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/82de7c7805af63503f3f7cef4044875b/fejedikerazujofatagaram.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821e69844e4---fuweretixexajo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c69d44ba---49654190846.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/46257118214.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2j62f5b1cr1kaimkd4u8jji5m2/4570796607.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/7993352074.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/tumijutagotanogaboko.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/52967249029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=printable+catan+cardsPDF 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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 16964 bytes
SHA-256: 2d61dcc5f4ba76f2e9eb7fd3646463afa0268396b6ce26b35c48dd5e426bad55
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10384 bytes
SHA-256: 996bef77b0ad75090b26f760747fe33e21321eed04ab3158f33f870981ffd73b
font_02_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1