Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef112233e1c7ad0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 04:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a09c684d7ba194bb480c41e40928a0b SHA-1: de3637005e7f03146ed385481ac5005ae15a9ab0 SHA-256: 9ef112233e1c7ad0a449d65f26a6aa70385aba8c84e6cff3fbd8df0af1bee0aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://oishisushigd.com/uploads/files/ruzop.pdf In PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/70512106184.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/65734032933.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jomera.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///robefesapawipobuzit.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/34b2ef65208232b5759e4c077fa6ddd9/83663715662.pdfIn PDF document text
    • https://irantruck.ir/data/file/pafanuruniletotavivok.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/27313689861.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/21021616294.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/56e2bd6ddbc2e8f789f02f34a1bc3aa7/refejilonew.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210810_C3A67FA14787BD4E.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/84979963091.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2abc7ab2c54d1b159fabf29e9526b337/32081443537.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/36326894472.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/63666c7e878fb75150120677bc71b3a2/53637218083.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fibuzavipodo.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/g62t0gaa50si9u46bt5nusla32/58744720581.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/55913c4315d69a45536874879eb33c52/13785494569.pdfIn PDF document text
    • http://lovesenergy.com/file/51908729010.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e688c59d07e206d2961d885662c43113/tojog.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/pivubojizotikutufepe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbda9238b2---zazikararusaxavolafovexav.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zefuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=val+dancing+with+the+starsPDF 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 18980 bytes
SHA-256: d58a5d9e72df35be8fdbcdb7381c9156a08bbd07143afc0dc522ef72b1d3ecfa
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 10584 bytes
SHA-256: 5500b350c092106cb6794c47ad13120970b49682e8f0d16947b373a227968ae7