Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c07430fb0d0dfb4…

MALICIOUS

PDF

77.9 KB Created: 2021-06-29 23:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd7abaa8ad8f8c8625db7b90b5bf7362 SHA-1: e16cac81d070b6b0524c38e29229566d50e35b87 SHA-256: 1c07430fb0d0dfb42370033b4e7ba32ee4376114d11378df50123710c1109a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=on+and+off+contractions+at+39+weeks
    • https://tangentemag.com/img/file/jedizajevubezenirurefoles.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1f8f80e603a4bc8ad70a4771f254579b/67169284605.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073967e46a03---jupivivexoredulosowa.pdf
    • http://toyteepee.com/uploadfiles/file/2105250603029826711m6de6.pdf
    • http://zwickerfoto.hu/_user/file/82052824072.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/64b5a4954ce450727947f3f3fa8a7e43/30543162578.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d19fb401ec7---48986389666.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1943464c8a08f288dd740eb5ada21d3a/bugirefadijim.pdf
    • https://togeltop.net/contents//files/nibus.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944306a9fa5---tumabu.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1636cf56e---masivibekabonoz.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/d1p1bokcpq1b3hrm3oqkh04aj6/bomererofugekisilad.pdf
    • https://lacecinella.com/writable/public/userfiles/file/putetizoxuwe.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/u136qgthlsisdachoohb16qko1/lixagu.pdf
    • https://atpl.aero/ckfinder/userfiles/files/vebizegisu.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ae4987eaac8523afca1d5f388fd6e023/87719994986.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2345929ba---59646410371.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078996037729---xivezuwidadazuxu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080618abc837---37817337994.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b51686930fe---fobik.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608009ace73fb---felokimed.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24523ac71---kerowo.pdf
    • https://tedvandergulik.nl/userimages/file/wolitopewuxuriso.pdf
    • 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_off0000cb1a.bin
1345fb0b476292a8cc946661d9d5a56c27e057417e6637dd0cc7d8a8e228824f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 10968 bytes
font_01_sfnt_off0000e4d4.bin
36d475523ee7205161c10e946428411a8e1252425828cbd5ad7f1eccfe32451a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 17288 bytes
font_02_sfnt_off00011217.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes

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