Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a87565353f77bd…

MALICIOUS

PDF

86.1 KB Created: 2021-07-22 23:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a930fc26acd98c207bd22efde734db SHA-1: 4cc49d03fa84788e40cc4299670bcf17f31c8012 SHA-256: 96a87565353f77bd30f350a44beed2a6d1344d47a1e923969a383a0d255c274e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://naoshima-habitant.com/woxokaxebiwadifukubot.pdf
    • http://bsbcarpet.com/userfiles/file/dizet.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9982e65e---30344907077.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab29a459bb---suzadamozajumulor.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9ca721ba13c4ce519b163c76b9d9dc19/lexivakaritugopajiwibozel.pdf
    • http://bulk-supplies.com/userfiles/file/sukuzozabosiwateru.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb32373b7a---83839785270.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/2324583429.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b49a88f7f---28047974243.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9cc327f77c9a544df12800155e6afeab/sinutezuzodolejiwanam.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/9842edf1c4239128e366818cee778cda/rifenenot.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e1a2d933cd2a7463dc8a0e98af132750/58316318341.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1f902016---vusofezawovati.pdf
    • http://mp-journal.com/media/file/bibonovugolumi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0649088989---99944927403.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6a291533---27020183899.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/94562343236.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/r0pcvdc4b1962eucpqh6u7fhfp/34128641865.pdf
    • http://iglozawiercie.pl/zdjecia/file/91514525150.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6082454ffa984fcf952e32d249965d52/5681187221.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b16a82551a303bd63a1621ed3fe9b0bc/dowawuxisazaxeketazi.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/pajovesoxowa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=why+do+green+plants+require+solar+energy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecba.bin
0f0d15080916efd7beac37abe616d1601dc5ef93809148f7dcba50ff8bf8f5f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 11024 bytes
font_01_sfnt_off000105c7.bin
fa7a62988471da910afbf096d5334b9d02d88af8afcac79333ff300772b5bff1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 17052 bytes
font_02_sfnt_off00013232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 16792 bytes