Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ae88bc169d09b8…

MALICIOUS

PDF

80.7 KB Created: 2021-06-28 06:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78e2299c5d5597963fb151dc587585a0 SHA-1: d119be7c4617d0064cb233c5f268d3f53186fa88 SHA-256: c9ae88bc169d09b878ecff6439e2afb30b9d6bb880592d635befd31ebc0a320f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pasekesuzitokebo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249e2d66e5---tubofumo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf506bdcbf---15674929314.pdf
    • http://petra-dario.info/upload/datoteke/sagofiluse.pdf
    • http://jfac.kr/ckfinder/userfiles/files/43730894304.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ee28da1---43856799972.pdf
    • http://weorderfood.com/uploads/files/nunegoludababiwuf.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ea98261a---rinepokepunazutimevogupo.pdf
    • http://deltools.com/userfiles/file/22154172734.pdf
    • https://dichvumayphoto.vn/webroot/img/files/mejefukemovow.pdf
    • http://aaaexpressheating.com/userfiles/file/7760768197.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607088ed517c1---32999697036.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941a42c01ba---vowawelifutageg.pdf
    • http://pospatrans.cz/UserFiles/File/wemokubevovefos.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/o5r0heah6kpe3obu9f6tnithfn/bezudigofu.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mfikcqq2rvf2u2susfp77kk7tm/69309566889.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dnn418g8nkv5lr8817uhr74hm0/5447393097.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807a35055a5---xawibimutegixa.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcei53qv0clda5r7u6c7v0nr65/jimuzomuv.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98c3c4b35---81956511474.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9516b88f4bd10df5a5d32cca83ca0ddd/10304110736.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/96g90ap1bgh8f287dqk4v7dg7h/79584331937.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=disposition+of+funds
    • 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_off0000d925.bin
7b2b047584d1a64a86b17d8cc3886080def049ff6f48d1b353220d9c73d16cc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 17676 bytes
font_01_sfnt_off0001070d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 16792 bytes
font_02_sfnt_off00011f24.bin
491be609c3c1299da385795d55d07dffd129aefbc6b32d812f2d7c1c0e3b0d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 10152 bytes