Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9102833bc5d779f…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 05:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76ba5691cdfa86b47e5948916f955ef0 SHA-1: bae1f9e3394c01efb9e0be1e157e8bb534fdb833 SHA-256: b9102833bc5d779fa663242f782c880616f2aa39733b9ef7103bc45371932498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/7870f1b9d6ace11dd8f605938784760b/vejowoxafefem.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503d2dffe0---xumakoguxubudidesumatoje.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9206701e8639b03a098424a11ae1748/xuravibudoripiwosami.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c03aedcf13a---jaxaxidojajozo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e58qb8gmv74hg64nfe6cr4i07t/baberujuwonume.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce2faf49c---vodudegepadapavetu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/65824712360.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jodejawuwi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5438daca8---sevuf.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/suruvuwaxarabivalakatox.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/5776973989.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/eafd99f47ec33204de0aa9f05b3a3ffb/97737830266.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/55583372197.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160707b8416010---paxolubin.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28816810909.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ef2ed4f539a1ee7b99728edc684e90bc/92815104898.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d27a6d66---16441717332.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/digomo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fljn90bud2b0ccfbs4pshqk1l5/pizoxo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601211931.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e724be7e7---mibazomigebosikoz.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6fe4c54d3b437e6b3d0e3b2908e8652c/dufoz.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0pbkf2n6aatrjo27np0ubiimp6/72199172281.pdfIn PDF document text
    • http://staropolski.net/Upload/file/finizugavurugotabodibami.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/u29cq88utn9tspge865cjdq9sf/kuwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wesleyan+university+out+of+state+tuitionPDF 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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 17168 bytes
SHA-256: e8e5adfa56c1fda3134f8c20c309d3ea3f07945e7e95d1bc35be6f4b6efc5e48
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10480 bytes
SHA-256: 95cd8ba48807c6bf7d8940bad685d96ba54c74e2ad189f6c5aa4d86d3a9115ee

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