Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b01af2d4603f95…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 14:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebb50e66e61cdc4f440a73e9afefa16a SHA-1: 276436baf938e599baf5d7c3de0df8bab6b7a2a6 SHA-256: 13b01af2d4603f956cf1989813b2585884fa702a8bbbbc44c3b74e0e8c12f85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://psfund.org/public/uploads/files/cms_files/xodakipanez.pdf In PDF document text
    • http://pokewaveanaheim.com/uploads/files/61149009518.pdfIn PDF document text
    • https://coluer.ir/documents/file/momexakokizavuzi.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/71421188336.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160daedfdd87bd---rixekusiwilevomupovevefeb.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1e1aebfd1d5e331f3d2f217f43017375/wozesovow.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/pirizajumogififonipego.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611757f401a95---81581146216.pdfIn PDF document text
    • http://erex.hu/upload/file/diniludokosotusazopoti.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f315ced8---vuvamemulaputimewumusup.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd1b56d24---6890998892.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/87942543210.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210813095211_2j789c.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jasuge.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/13560333757.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pd3btsv2pjq8n9uvtmrvcpnk02/zikonixoga.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518044839289619.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/jijanolifefebugelo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/40908809499.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/64056222240.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kotesijodigikakexa.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/54069074857.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/mozesawoseneviweberegoso.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wizisufina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=come+scrivere+su+pdf+con+acrobat+readerPDF link annotation
    • 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_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 18652 bytes
SHA-256: a3917cc475d59de876d64bfa9844e5a225dd75622f7b87190d640a03abc14747
font_02_sfnt_off00015321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15321 11072 bytes
SHA-256: 35b7e02bdf1bdcc6575d6fef575f1c7df0e0780b735e5cb625db728734c3619a