Malicious PDF — malware analysis report

Static analysis result for SHA-256 3610f2bb610aa9d2…

MALICIOUS

PDF

96.4 KB Created: 2021-09-14 12:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 977a87773618fcefeddbbd6eb78697ea SHA-1: f3edd036caa16e5499ff0fb97e32c9a027f0027b SHA-256: 3610f2bb610aa9d2263ba09733e9ab63fdd5f38e8ca1981ad08c543a9acd83f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://autovoda.ru/upload/files/43532183003.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a856717f90---67399355076.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6dcc5476---lawuwepigananikawenovipex.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6ct6tmu4h66ol32g08mbp5ialr/xizamaxozokubug.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/5850360517.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xiledarigutaterelomodotot.pdfIn PDF document text
    • http://samtekelektrik.com/files/jupukufilugigunerof.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/5178543245.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/foxegarikokev.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090212061073499.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/xipukizofugawisovitulut.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/ruviluzej.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/koxojozenasujopeduzuvo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/35956346947.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/78dca4d8f62f8af3d666a9c366547d63/74453655387.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109132047321047.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uof176crp8ljs6s2hbqausqrf8/72840781312.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/245vu2q8j3opbuo8ad16khe6ui/63391893131.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lokazafe.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/36335088631.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/manowuvotepoxebat.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/pusojifixozokotopeb.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/49117513866.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/22558706538.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zakudurididaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=instagram+following+increasing+automaticallyPDF 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_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10928 bytes
SHA-256: a7fcc2e21d923e87ae4587315532ce3ea30eb047608e71c74156bafefee0a0a5
font_01_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14365 18556 bytes
SHA-256: 1ee1915bba632b89836eef02f6598ba5cf620a53df42d76b0237cf67b4bd6615

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