Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffad37ad1efe5549…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 02:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d69922fb1e4f5186d3828ffcea76acf SHA-1: 2039c15f10122c28655e79a911ca827f5d4d47dd SHA-256: ffad37ad1efe5549d95b12afe8ae577010374ade910bc37bcd9a097049c3c0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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 http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vepubofavegotudilazari.pdf In PDF document text
    • http://thuexe7cho.vn/upload/files/detuvenogasojijon.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/41944434971.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cf929204---rififesefogisavelijevebot.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/xidalis.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/jifezake.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/57269609032.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/27403450366.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/91115640524.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608596849143d---moxulubamunin.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/46801465618.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/tufijorufasosimakabewire.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbdc9186d95c56f029d23171fbd9d8c5/48424607200.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/pajelolitop.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/5848891836.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/lixakumovesixazi.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/wuratokezilefavixowuse.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/nizujet.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zenifiwojo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15137a6e5---dabukefosufolajomemupu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o8klbln4rg86g18ce6f93g42gk/femigevakufujino.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/94146853887.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/60740113701.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/funokunodajosexiwo.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108101454189455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gf+free+cookie+recipesPDF 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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 17616 bytes
SHA-256: f62ecdf33ec0ab6869f573adad15e442151353a7afd800f40c1af13408091087
font_01_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 10196 bytes
SHA-256: ecffed662237ed0e48b687ecf328287525019c64b110921fae1f6a52f3d3b4a0
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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