Malicious PDF — malware analysis report

Static analysis result for SHA-256 927a814cbbbfd038…

MALICIOUS

PDF

84.1 KB Created: 2021-10-05 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95687402b57d164e6172e69761fac010 SHA-1: 652500cbbdae86d0adc75868decb188572e8196d SHA-256: 927a814cbbbfd03820c9586f9f4b0b3ee700e0d04d4acaa9cb3fee4a501dcc9b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or host other PDF files. Heuristics indicate it functions as a link farm, with some links hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bienchidan.org/uploads/files/febina.pdf In PDF document text
    • http://megalaserasia.com/upload///54218854707.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/rilipufiru.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d4a32de---pewapas.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/tilelenatarupibuka.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/femuzoredenugavot.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/28796819135.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2c23e89c9d2adec300f36b0876aab373/kobonupexegika.pdfIn PDF document text
    • http://clickvay.com/upload/files/lerigixurik.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/roluponosoperize.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16148cef474112---98558794432.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429469d0243---mojow.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/22059180027.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/79526091715.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/6552430348.pdfIn PDF document text
    • https://costarica4d.com/contents/files/towuwuvepov.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lorejemibubarav.pdfIn PDF document text
    • http://ccadl.com/files/20210921182212.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/36244856637.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091149d3eb---45490989937.pdfIn PDF document text
    • https://panama4d.com/contents/files/pofigofirimajiredobive.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/81056316499.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/34481811849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+sign+dog+in+aslPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 10268 bytes
SHA-256: c15b2dd77d16e50af8f93c349a2f0032f1f0761ccd47fdcc0dfcfd362f5722c1
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 18988 bytes
SHA-256: e03f249398fb88da5d6d36209d0c82dc938c62c54ff658a3d7d491798289cf2b
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1