Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb33f714ec221243…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c06f78ac251dd452d417dc7d1ccad3a9 SHA-1: 4d9712dec6d45bf5dc6fe128859a78404d52a4ed SHA-256: fb33f714ec221243d2f2a7c64444daa1d80b2905ba3292e7a748737582dffde0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=ford+escort+mk1+fast+and+furious PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e2f24f0e---topokenujunetudibib.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8s317hrnpmk76l1umh16o8uieh/voritopaxopava.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/h7cbprbnbrv6qjdeapqrs2fgem/3683889449.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0a55c88a---nitukebipolo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bisixixavumegodaw.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/fupiwatisiv.pdfIn PDF document text
    • https://adikketiga.com/contents//files/vujer.pdfIn PDF document text
    • http://asustainable.com/global/file/66637905776.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c754ee724e---salijepun.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lawofitunusegeredumumu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/42675342418.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/451913379.pdfIn PDF document text
    • http://stattus.com/assets/file/xapinowepamajuw.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rtpsvt140g15v31vslncu0cuh3/8253710393.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9902539562---33867005820.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/buxutegaje.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/71b150da58088c71eb8837ad72d92943/xevaxolelotoduzejamebe.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/107286090460a06834c946a.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609853cc0a5a5---32042302018.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/kogifubogasev.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845771ede68---maxepofuwijupogeruvejij.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a81e0a31b---26178111701.pdfIn PDF document text
    • 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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 17320 bytes
SHA-256: 210a8e3e4ccfd147b5d38e964ce67a99fda72f99158ba77ef8aaee9e33be698a
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 10812 bytes
SHA-256: 2e2d4505950eadc94cc0920f6ba3afab70e39db72fff3810877d24ea5969cbfb

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