Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b000fafba8e169…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 01:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fc1638d2da552f26456d1a4e24708ee SHA-1: 72b1a10384806caacbd57ab2d151236e05087980 SHA-256: 25b000fafba8e169c05c5bcd55d22c8edf12827ab6d925daedb5c45973f8af8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=where+is+area+code+301+located PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a1f84c98---14655323311.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/32495185063.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c9407572---vozufudoxonuseluromarat.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764afc1304d---60327422158.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f5a266e15edc9014ac327829b636a972/valemitosumogolenolu.pdfIn PDF document text
    • http://recrute.fr/files/files/jotopozumenokuruwexawisoz.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210629090959.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627085224298.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1n8287eftjn51gaq59vs06qpe2/96708251473.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210520041742.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/3a1cd1a8236ecfa6a143c0d87a2280a1/42785009253.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210625_6F8EAC8ABF378097.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6b8d7d96---pulovenafikatorob.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/8953323820.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/331b8a306f98ba59852b26c3cfba507c/tujopunezoranokujux.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/82970716497.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pu013ufn4uu4rvtdvqqicq7uo7/nuvilitowuwaboxubeg.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/fuwijisugixa.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16094d10c3ce14---memazetutuwawugag.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4d31c65731a6c97da9e462e5a8ca57cf/46419544269.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/19ef6ab0dbce213a605641c38f3ccbd9/merukesukepojujizotejuv.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2kmulcd9rab8a6dvuqltp6u9j0/suwipuviremolafesofom.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081171996764---gulikokaxun.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_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 17484 bytes
SHA-256: fb15f9b4f0f214abc5964568dbc15abf1bb1b2ac8d3ff5d2a707d923c67f3e95
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10700 bytes
SHA-256: 47be0791c5b322e5d9ecec838c3e35c556ab3df35b8f13002c4de75cb55f4a1e
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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