Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3375f477857a76…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 18:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f9667eda6b6b4ea07e77b55a5c5876b SHA-1: a70e235eb88afadfb823d3ae743cba9e7a4c34c4 SHA-256: 8f3375f477857a76e2d89974dc5f750acff886c5c348811b08cfea47e59583a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/feavvcjc3b50ia2h061g7kpjq0/gujixijawugidolejibenemu.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/79i3tq3ife84og0d3fasvid66p/gupizumekejari.pdfIn PDF document text
    • http://bscartridge.com/pic/ragowazifilumatedifafutam.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/853180314.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/30402457240.pdfIn PDF document text
    • https://yellowstonewildlife.com/lokujixolajujinasodiraloj.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/mawufujepupigozevapuz.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/wolef.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/64870104795.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ead330e09af790d8a0233ad541c2d42c/70965799364.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0948094b3---zexixavililakur.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/nulidaxuwi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/87bc1f2e442c038f4349e649bbc80aa2/bugekurapidosutu.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/mazabota.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5503dc49---vagoposazixikapu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/15259349500.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a481890b---72473866307.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210730014736.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/poxuguwogavutukonekisizog.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/35622158288.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54400577648.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/af85ebc2602a0467b431bea08bf0f31d/bukoxi.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/46582297300.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/59vbtbhlpr754kor57q9vd8s8o/33370123479.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jajivuxumi.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/80312887477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=objects+first+with+java+5th+edition+pdfPDF 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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 17372 bytes
SHA-256: f22c4c73140db7824a682877fc94832be16b806f5e3e794183dd0f1da664ce7e
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 11252 bytes
SHA-256: f8662049bcea12c55fab2e1bff610852cd0bf7221adff64ee2063d1050057714
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1