Malicious PDF — malware analysis report

Static analysis result for SHA-256 65384ed21ef4bb5c…

MALICIOUS

PDF

97.1 KB Created: 2021-08-13 07:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d2fb66f9d4ec3ad8b3de2ba346da70f SHA-1: 7cafd40b4592e47a890e78fac54eba940f076cb6 SHA-256: 65384ed21ef4bb5c67f2b019d1d7313f2fe35c3e9e41c7ffa5a9f1d35af48402
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://krisoc.ru/uplcv?utm_term=fifa+14+mod+19+apk+data+offline PDF link annotation
    • https://corpusbg.com/files/fck/file/37877539464.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/60574763511.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1d99868b02ebd1a1887bb5e2e8bd433d/vofolo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608524a3e0a1d---xuwuzesa.pdfIn PDF document text
    • http://www.520amis.com/upload/files/79375527888.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/8925855916.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca2c070260d9be7860dc4ad981c4d8b9/gojezonijematug.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dc28489715fd1007716d5f1cfbe70a21/40473017317.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c873cf7cd78---17852995010.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/negil.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/67ff61d395c6ce4a0aa9a0fc5b30bd7c/molifowidosetejijoxoba.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b9665498510ce73674f0f8d19932506f/fovide.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/regefenabamirod.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/xegazoxirenipu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/999fee9b92843d31a555ba3121d8e696/vawin.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/88130288258.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5mfcmhjhalbgc4arit0f4s2730/vulukojerefidedone.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/02730758f48bd4753d6f0d22fa77834c/judorefugadatupemogexawod.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c3bd67b0c185d3063e3563cec721710c/649601354.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/045869a5428a0f12687dcb749b90625e/33337993946.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe6c3e131b---76300014207.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/9918957474.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000152fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x152FB 20692 bytes
SHA-256: 8f620b680698aa759f6ac1b19234ed0593792c3a28cd821bcbfcae64e8e264cd
font_00_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 17432 bytes
SHA-256: 966173236368a8ee06283addf0cf720d511c65a428710eb59727e0de933da737
font_01_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 10760 bytes
SHA-256: 28b1b35e5c8818ff155bbac57309cc0d0d91656cea0eac85b8a25b274b9c1cd4

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