Malicious PDF — malware analysis report

Static analysis result for SHA-256 228a60ed063540b3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 00:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc8054e29ce14505dfed27914b813f83 SHA-1: ac71c4c2d058989ff5dce552f16e132f13a1b0be SHA-256: 228a60ed063540b310ae0c55349dffd8b822825962004bad330454f0ac5cb5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the PDF's purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=40+oz+is+equal+to+how+many+cups PDF link annotation
    • http://staropolski.net/Upload/file/69447911191.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a94d6e8fc68d873708edd4d90b1b9d95/84431121469.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/81146830904.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cer4vfl9uohgsef364b66sgv3/91703090262.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jafuminutuditek.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/tixebe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c605bd4bc---vasumulovugipis.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7dcaf69a---62145348467.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/90199678626.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/zefusaz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6178c7cabe---xulabepopibopasinofipi.pdfIn PDF document text
    • http://nenorm.com/files/files/2962745115.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/barilogazo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411502a9be---67302095619.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/zerelideledig.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/poteridajelubidaninovesam.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/bijirewovejaxo.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/rodixafamigodififapa.pdfIn PDF document text
    • https://limsurdua.com/contents//files/74957950389.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/92110234429.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/53325696797.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/sewanaluxazoparu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/16984334749.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ods864pejr31oadem62jupmfnt/50367342345.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 11148 bytes
SHA-256: c85c6170d6ee675e26adee5dd0e226077e7a0d8888f7b19f5cd5564ed484f3e3
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 18184 bytes
SHA-256: 6ae96acc18d18ec8e34ccd1a6b87ed0993b8d1f84dc28a0e824b4203cfb1435e
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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