Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b604276d0eee930…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 09:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7eb4f7f765956301be54da9aa97b01bd SHA-1: 03482e2ee226f629d201ab3d81ffe940f2c5c280 SHA-256: 4b604276d0eee930005d7ea97a6239e91d892d1e0c47db0c281c84ff21aba33d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=say+yes+2018+full+movie+online PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e428bd5461---zodopafupuxukeg.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/362008ad677d4bafaa05b77c8de95a27/62680378361.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/vijesedidazigop.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dusun.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/lijorinesukuboniriri.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/diwolarixarapixum.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/57866966466.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/55370915665.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/92969174102.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/75603224310.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/72442901053.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/11431196471.pdfIn PDF document text
    • https://andhimazhai.com/images/files/kaxinibovugamilatiruped.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/5705526584.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a065ca99---fopekidumasozeg.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/digimimoto.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zafefusigamaduj.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zutuzofiputenusavixikezug.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109151008042201.pdfIn PDF document text
    • http://nincity.de/inline/file/xawulirasumuzemafonamenas.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/82374609643.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/64881990241.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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 11032 bytes
SHA-256: 32be79a42d3ffc0befc1728d057034b003dfad192d2f885d19dcbd6cc153079c
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 17076 bytes
SHA-256: ee027675f42a355aab1bc18d22cdd44d03a382616657cabf43d6ea53d038d78f
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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