Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8ae691712d003…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 02:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee1215892f509654a6fdbcb395d88e1a SHA-1: eacd08da461aa57cab0d34f75baee35be515e347 SHA-256: f8b8ae691712d003124dff3f59b14008c925d6469b99051884edd6a95a824b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=call+me+by+your+name+ebook+free PDF link annotation
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dt6vsp5g6g9j7l6fhov2bninj4/dipowutogaj.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dde7ad124179fff6c48e72a7a5d0e2aa/14370751766.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nujenisaxo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3c43fb25---37950329598.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/66075502606.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130727e0aefc---12613252603.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/54781463268.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/10052929407.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/zesome.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138b63e24dee---zibumosevokunuxuguseved.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/54375086240.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/netetepofumirupepovo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/julekeseromukagedezataset.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/kabufexukijumibavoxajafe.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/67666982825.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/90944513087.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/benonetapa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_135530.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/66755903683.pdfIn PDF document text
    • http://mastervin.ru/files/file/pilunosete.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/sowotaxinujo.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/79260736711.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
font_00_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10492 bytes
SHA-256: 930344f180722709395633ae4a2daca861f30c8da61f6b4d8de3219933f1addf
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 17804 bytes
SHA-256: 3df2d249335767505071eee8382bd57de5c468fa4361512d51409d99f6263d84
font_03_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 17176 bytes
SHA-256: 84782a629fb411976b57474190a90e28f14a3117eb0b807f5deda3868b960517

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