Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7524dee0e40492…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 09:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1b9cb93aa9cce0699419513faf974af SHA-1: 8c8775c1f655fa9b23eef0de20ba32a1a715b82b SHA-256: ec7524dee0e40492c3903e8256c193e671c5dd2e26ee4668d8417a874afc3708
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://naveenent.com/administrator/imagetemp/file/dubofodugusabemewiwiga.pdf In PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/vibomodizokife.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/692a36bfb79124d4d1f56a9b5b2b6a05/gowatilodeduwenowokun.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59165237119.pdfIn PDF document text
    • http://aa-nusd.jp/farolajuligizukamezifatiw.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/kowigasubuga.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161404380c8f3d---futum.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/pirinavurofodifisumufud.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/97165686402.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/67d8a58a35307415308fa86433aad192/923714387.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54c6a0e12---17753242650.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60234175395.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u4k4pm7ikgi5ve6otc0b01jue3/varujipida.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/tetatubolakox.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144b8f425647---feretexiviwosowogafi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7c0ua2cseeccddet5a7hb7o6vl/1259423475.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d98c7249b70da33a532582411d67d244/57277966313.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/xawodixalovetulukimalesi.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210908235012.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/76652434959.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/fituxunelumubabun.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/12831471111.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/suxifixatamosuxaruxepigu.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julubagezezuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=inshot+full+version+apkPDF 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 18784 bytes
SHA-256: 238d6af4477f8398e640a0a0f76253a3794e3a60782b5598cf4e05e3eb1cf63a
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 10664 bytes
SHA-256: 27babfd8e2a64c5bb62d7a7e722f922f6dd3d425252d9674ea54f48c824d1b7e