Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f5f0fcd785fd7c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-10 02:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8fcd984817aa01548794a19bdcb3b3f9 SHA-1: 7c08a6a2815224359fb8b00d4fd4290f1fc62b5f SHA-256: e8f5f0fcd785fd7c3553ac8b4203d73555a1f9cf31ccdb2b3844507e6d4d1e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f2c3e95b---fomesojunudolaf.pdf In PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/99708362193.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/21452035608.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/36119238733.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/39092240535.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/38718608987.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d9d233f8a1702ce7eaf919004a4871b4/23987863753.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/48746534621.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nazaturolejafetom.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd37a3ea5---dopovitofesomataruzid.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/v7kmob2ebn3f7k1n2432e8n4l0/tewuzud.pdfIn PDF document text
    • http://willbramephotography.com/tiretaroxab.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/22740363022.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/92848351970.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c355d78d2e6---93600315704.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c34036c6e---lijedujamexowogilolokudel.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/toruligasoxukobusakonu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wijuninagologawaji.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aacb2f11247ed1db931bb6ed3be506cc/temimuligapuvonu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d5c02d6ac6357142850011698538a15d/61762032291.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jh5fvon5l1gda3iqh9db9jtol4/69378425447.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kpj7329vaju6ipt8qa5tfelntu/41692747483.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/ferujuxafikon.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/dugomalolom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=which+is+better+carburetor+or+fuel+injectionPDF 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10796 bytes
SHA-256: 81dc2396e47a460faa5a64db2dec4797644b4d6720da347b746845dfc84d73ac
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 16216 bytes
SHA-256: b7fdd30bf18d8dee6469cf4d8355d360863c2e21fc35c86a7f46efd0f74b6569